Miranda Lambert's boyfriend Anderson East calls out Garth Brooks for lip-syncing at the 2017 CMAs

Anderson East is calling out Garth Brooks for lip-syncing at the 2017 CMA Awards on Wednesday night.

East, who dates country superstar Miranda Lambert, took to Instagram on Thursday to reveal that Brooks' decision to lip sync on country music's biggest night -- the same night that Brooks was awarded Entertainer of the Year, no less -- "truly offends" him as a singer-songwriter, People reports.

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"I keep a lot of my opinions to myself and respect anyone making music, but as a person who tried to put on the best and most honest show I can night after night... this truly offends me," he wrote. "I was told country music is three chords and the truth."

See photos of Garth Brooks and wife Trisha Yearwood:

31 PHOTOS
Garth Brooks and Trisha Yearwood through the years
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Garth Brooks and Trisha Yearwood through the years
WASHINGTON, DC - DECEMBER 04: Garth Brooks and Trisha Yearwood arrive at the 39th Annual Kennedy Center Honors at The Kennedy Center on December 4, 2016 in Washington, DC. (Photo by Paul Morigi/WireImage)
WASHINGTON, DC - DECEMBER 01: Garth Brooks and Trisha Yearwood pose for a photo backstage at the 94th Annual National Christmas Tree Lighting Ceremony on the Ellipse in President� Park on December 1, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images)
CHRISTMAS IN ROCKEFELLER CENTER -- Pictured: (l-r) Trisha Yearwood and Garth Brooks rehearse for the 2016 Christmas in Rockefeller Center -- (Photo by: Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
Garth Brooks and Trisha Yearwood perform a medley of songs at the 50th Annual Country Music Association Awards in Nashville, Tennessee, U.S., November 2, 2016. REUTERS/Harrison McClary
NASHVILLE, TN - NOVEMBER 02: Singers Garth Brooks and Trisha Yearwood attend the 50th annual CMA Awards at the Bridgestone Arena on November 2, 2016 in Nashville, Tennessee. (Photo by Jason Davis/FilmMagic)
ANAHEIM, CA - SEPTEMBER 16: Garth Brooks and Trisha Yearwood Pre-Concert Press Conference at Honda Center on September 16, 2016 in Anaheim, California. (Photo by Jerod Harris/Getty Images)
NEW YORK, NY - JULY 08: Garth Brooks and Trisha Yearwood speak during press conference at Yankee Stadium on July 8, 2016 in New York City. (Photo by Chance Yeh/FilmMagic)
LAS VEGAS, NV - JUNE 24: Singer Trisha Yearwood (L) and singer/songwriter Garth Brooks speak during a news conference ahead of the first of their six scheduled shows at T-Mobile Arena on June 24, 2016 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
NASHVILLE, TN - NOVEMBER 04: Garth Brooks and Trisha Yearwood attend the 49th annual CMA Awards at the Bridgestone Arena on November 4, 2015 in Nashville, Tennessee. (Photo by Taylor Hill/Getty Images)
ARLINGTON, TX - APRIL 19: Honoree Garth Brooks (L) and singer Trisha Yearwood attend the 50th Academy Of Country Music Awards at AT&T Stadium on April 19, 2015 in Arlington, Texas. (Photo by C Flanigan/FilmMagic)
ARLINGTON, TX - APRIL 19: Musicians Trisha Yearwood (L) and Garth Brooks attend the 50th Academy Of Country Music Awards at AT&T Stadium on April 19, 2015 in Arlington, Texas. (Photo by Michael Buckner/ACM2015/Getty Images for dcp)
DALLAS, TX - APRIL 17: Hosts Trisha Yearwood (L) and Garth Brooks perform onstage during the ACM Lifting Lives Gala at the Omni Hotel on April 17, 2015 in Dallas, Texas. (Photo by Jason Kempin/ACM2015/Getty Images for dcp)
DALLAS, TX - APRIL 17: Hosts Garth Brooks (L) and Trisha Yearwood kiss onstage during the ACM Lifting Lives Gala at the Omni Hotel on April 17, 2015 in Dallas, Texas. (Photo by Jason Merritt/ACM2015/Getty Images for dcp)
NASHVILLE, TN - FEBRUARY 25: Recording artists Trisha Yearwood and Garth Brooks present awards during the Opening Ceremonies of CRS 2015 on February 25, 2015 at the Nashville Convention Center in Nashville, Tennessee. (Photo by Jason Davis/WireImage)
NEW YORK, NY - NOVEMBER 17: Trisha Yearwood and Garth Brooks attend the ASCAP Centennial Awards at Waldorf Astoria Hotel on November 17, 2014 in New York City. (Photo by Brian Ach/Getty Images for ASCAP)
ATLANTA, GA - SEPTEMBER 19: Garth Brooks and Trisha Yearwood attend a press conference at Children's Healthcare of Atlanta at Scottish Rite on September 19, 2014 in Atlanta, Georgia. (Photo by Chris McKay/Getty Images)
LAS VEGAS, NV - APRIL 06: Recording artists Garth Brooks (L) and Trisha Yearwood attend the 49th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 6, 2014 in Las Vegas, Nevada. (Photo by Rick Diamond/ACMA2014/Getty Images for ACM)
NASHVILLE, TN - NOVEMBER 22: Trisha Yearwood and Garth Brooks perform during Playin' Possum! The Final No Show Tribute To George Jones at Bridgestone Arena on November 22, 2013 in Nashville, Tennessee. (Photo by Frederick Breedon IV/FilmMagic)
NORMAN, OK - JULY 06: Musicians Trisha Yearwood and Garth Brooks speak in the press room at the Oklahoma Twister Relief Concert to benefit United Way of Central Oklahoma May Tornadoes Relief Fund at Gaylord Family Oklahoma Memorial Stadium on July 6, 2013 in Norman, Oklahoma. To donate go to www.unitedwayokc.org or text REBUILD to 52000. (Photo by Rick Diamond/Getty Images for Shock Ink)
NASHVILLE, TN - MARCH 06: Trisha Yearwood and Garth Brooks attends the 2012 Country Music Hall of Fame Inductees announcement at the Country Music Hall of Fame and Museum on March 6, 2012 in Nashville, Tennessee. (Photo by Frederick Breedon IV/FilmMagic)
Garth Brooks and Trisha Yearwood perform at the Juvenile Diabetes Research Foundation Gala at the Beverly Hilton on May 15, 2008 in Beverly Hills, California. (Photo by Matthew Simmons/WireImage)
NEW YORK, NY - JUNE 16: Performer Trisha Yearwood and inductee Garth Brooks attend the Songwriters Hall of Fame 42nd Annual Induction and Awards at The New York Marriott Marquis Hotel - Shubert Alley on June 16, 2011 in New York City. (Photo by Larry Busacca/Getty Images for Songwriters Hall of Fame)
Trisha Yearwood and Garth Brooks during 2007 MusiCares Person Of The Year Honoring Don Henley - Arrivals at Los Angeles Convention Center in Los Angeles, California, United States. (Photo by M. Tran/FilmMagic)
Trisha Yearwood and Garth Brooks (Photo by Michael Caulfield/WireImage for PMK/HBH)
Trisha Yearwood and Garth Brooks (Photo by SGranitz/WireImage for The Recording Academy)
Garth Brooks and Trisha Yearwood during Disneyland 50th Anniversary 'Happiest Homecoming On Earth' Celebration at Disneyland in Anaheim, California, United States. (Photo by Gregg DeGuire/WireImage)
Trisha Yearwood and Garth Brooks during 33rd Annual Songwriters Hall of Fame Awards at Sheraton Hotel in New York City, New York, United States. (Photo by Bill Davila/FilmMagic)
Garth Brooks and Trisha Yearwood during 33rd Annual Academy of Country Music Awards at Universal Ampitheater in Universal City, California, United States. (Photo by Ron Galella, Ltd./WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1222 -- Pictured: (l-r) Musical guests Garth Brooks and Trisha Yearwood on September 11, 1997 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
Garth Brooks and Trisha Yearwood during Songwriters Hall of Fame Awards - VIP Room at Sheraton Hotel in New York City, New York, United States. (Photo by L. Busacca/WireImage)
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The call-out came one day after Brooks performed "Ask Me How I Know" at the 51st Annual CMAs and told People backstage that he opted to lip-sync the performance because of the toll that his exhausting tour schedule has taken on his voice.

"We're in the middle of 12 shows in 10 days," he told People. "Not 10 shows in 12 days, 12 shows in 10 days. We did a game-time call on whether to sing the track or lip sync, and decided to lip sync. The voice just isn't there anymore, and you want to represent country music as best you can."

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Fans of the "Friends in Low Places" singer noticed that he was lip-syncing during the show, and when he admitted to the controversial move, they were outraged. Some called the decision "unacceptable" and "not what entertainers of the year do." Anderson East is the most high-profile figure to call Brooks out, though.

See photos of Miranda Lambert and Anderson East:

10 PHOTOS
Miranda Lambert and Anderson East together
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Miranda Lambert and Anderson East together
NASHVILLE, TN - NOVEMBER 08: Anderson East and Miranda Lambert attend the 51st annual CMA Awards at the Bridgestone Arena on November 8, 2017 in Nashville, Tennessee. (Photo by Taylor Hill/FilmMagic)
NASHVILLE, TN - JUNE 07: Anderson East and Miranda Lambert attend the 2017 CMT Music Awards at the Music City Center on June 7, 2017 in Nashville, Tennessee. (Photo by J. Merritt/FilmMagic)
NASHVILLE, TN - JUNE 08: Singer-songwriters Anderson East and Miranda Lambert attend the Miranda MuttNation March at Nissan Stadium on June 8, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
LAS VEGAS, NV - APRIL 02: Recording artists Anderson East (L) and recording artist Miranda Lambert arrive at the 52nd Academy Of Country Music Awards on April 2, 2017 in Las Vegas, Nevada. (Photo by Allen Berezovsky/WireImage for Fashion Media )
LAS VEGAS, NV - APRIL 02: Musican Anderson East (L) and singer-songwriter Miranda Lambert backstage during the 52nd Academy Of Country Music Awards at T-Mobile Arena on April 2, 2017 in Las Vegas, Nevada. (Photo by Rick Diamond/ACMA2017/Getty Images for ACM)
NASHVILLE, TN - NOVEMBER 02: Anderson East and Miranda Lambert attends the 50th annual CMA Awards at the Bridgestone Arena on November 2, 2016 in Nashville, Tennessee. (Photo by Michael Loccisano/Getty Images)
LAS VEGAS, NEVADA - APRIL 03: Anderson East and Miranda Lambert attend the 51st Academy Of Country Music Awards at MGM Grand Garden Arena on April 3, 2016 in Las Vegas, Nevada. (Photo by C Flanigan/FilmMagic)
LAS VEGAS, NV ? APRIL 03: Recording artist Keith Urban, Nicole Kidman, Miranda Lambert and Anderson East pose in the audience at the 51st Academy of Country Music Awards at MGM Grand Garden Arena on April 3, 2016 in Las Vegas, Nevada. (Photo by Christopher Polk/ACM2016/Getty Images for dcp)
LAS VEGAS, NEVADA - APRIL 03: (L-R) Recording artists Keith Urban, Miranda Lambert and Anderson East attend the 51st Academy of Country Music Awards at MGM Grand Garden Arena on April 3, 2016 in Las Vegas, Nevada. (Photo by John Shearer/ACM2016/Getty Images for dcp)
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