Conservatives/Moderates in grad school

So, I made the decision to go back to school for a PhD. I started about a month ago, and everything was very cool during the orientation period- I respect my cohort’s intellect and diversity, and I hope to learn a lot from the smart and thoughtful professors.
As I’m getting more into the program, I’m encountering unnecessary politicization from the more advanced students. One student went so far as to say, “and what about your white privilege?” after I talked about border checkpoints as part of a discussion on civil rights. I had literally never met her before and was appalled by her fallacious reasoning, presumptions, and racism. I’m pretty moderate- there has been systemic discrimination against racial minorities in this country and that does have effects worth studying, however, her statement was logically fallacious, presumptive, and racist. I don’t want to be a squeaky wheel, but I know I can only countenance crap like that so many times before I use logical reasoning to shut her down. Other students make irrelevant political comments out of the blue (like lamenting the US isn’t a direct democracy- not at all relevant to what we’re studying).
So, CSS, I know, but has anyone else been in a situation like this? How’d you deal with it?