I'm upset about my boyfriend's roommate coming home with him for thanksgiving
Do you hate your boyfriend's roommate?
Yes, he's an asshole. He came over to my place one day and said that I was the one who was an asshole.
You don't have to like all your partner's friends but you should be polite to them anyways. Otherwise you will upset your boyfriend and he will think that you are making trouble.
Okay, I'll still hate them, but I'll try to hide it and I won't blame my boyfriend.
That's sounds pretty reasonable. We can't really control who we like, but we can control our actions and treat people with kindness. Who knows, you might even end up becoming friends with them.