Growing up, my mother used to tell me things like, "if you don't have anything nice to say, then don't say anything at all," or "you have to play nice and do unto others as you want done unto you." Why? Because as a young child, you need to be taught to behave appropriately in certain situations -- especially environments like school, where you are mixed together with a lot of other people.
Ever feel like your boss's mother didn't teach him those life lessons? Do you have to deal with whiners, tattletales, tantrum-throwers, or other immature "adults" in your workplace? You are not alone.