Can My Employer Make Me Socialize With Co-Workers?

Office workers playing with balloons
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It's holiday party time, so this question I received from a reader is timely:

I just read your article about social media passwords, and I have a question for you that my HR person cannot seem to answer for me. My boss told me that I am not relating to the other employees (I didn't realize that I wasn't) and wants me to go to lunch with them or go shopping with them on the weekend. They are mean and spiteful people who look for any way to manipulate people. She asked me about my personal life and made me feel like I had to answer so I did tell her some things. (I won't make that mistake again.) She made personal comments about my relationship and encouraged me to break it off. I would never, ever tell anyone that. What are my rights here? I spoke with our HR department who said that she can say whatever she wants (no matter how rude!), but I can say, "It's my personal life and I do not wish to talk about it." Did they tell me the truth or leave part out? Can she make me go places on my breaks or off time with people I do not want to go anywhere with? I really need some help.

Thank you for advising me on this.