Not exactly political correctness in left vs right meaning but, where I am from, you would say something like "I would kill him/you" causally and no one will think twice. That sort of thing tends to freak out Americans (I know cause I said it) who tend to take it much more seriously. For me, it was just causal expression.
Americans expect you to show a lot more enthusiasm then Europeans and if you don't show it, they will consider you rude and act towards you accordingly. Every single question is "good question" - it seemed to be rude to say that some of them are not good questions even to third parties in social setting.
On political correctness: in my culture, I know maybe one person who would identify herself as feminist publicly. You are expected to dislike feminism even when you are pro-equality. It seems to be the opposite in American liberal campuses (tho radical feminism seems to be waaay more aggressive then anything I know in here). Moreover, what Americans consider "too revealing" seems "perfectly normal" to me. I have seen American boys react in surprising way toward girls that wore mini skirts that were short, but still within normal range to me.
So, if you want example of political correctness, people from here might consider it perfectly normal to blame feminity when woman does something stupid or just makes them angry - that definitely wont fly in many American groups. That does not necessary means the person who said it is sexist, I would even say actual sexist tend to be more careful over what they say in my experience. Nevertheless, American liberals would not accept such thing at all.