I'd call myself pretty compromising and think I'm pretty open to people with different views. I'd stay friends with people that are rather left leaning and moderate Trumpsters.
But I'd definitely draw the line before literal communists (or people that literally call for killing the rich or dispossession of property) and definitely before Qanon, proud boys or Covid-conspiracy theorists. Of course, both of these things never happen in my upper-class bubble, fortunately.
This list will probably vary depending on your own views - **but what what is something that you strongly disagree over but can still be friends? **