I hate my girlfriends family for always bringing up politics when they know it makes me uncomfortable
What is it about politics that you find so uncomfortable?
I got bullied by fangirl libertarians in college and when my girlfriend mentions them i get flashbacks.
I'm sorry you were put in that situation. It's wrong to make a guest uncomfortable, but I think if you explained why, they wouldn't do it anymore. It can be hard to talk about, but it may need to be discussed to avoid further hurt.
I just want to ignore politics, I don't want to talk about it.
If you don't want to go into detail about why it bothers you, then just tell them what you just told me.