In my personal experience there seems to be a pretty big difference based on the age. People who are like 26 are much less aggressive about it than people who are 18-22.
Considering how dumb/immature the average product of an American high school is at 18, I'm not surprised they think like that (and are aggressive about their beliefs) Also, considering how some choose to treat college like an extended party, they carry over the same traits to 22.
But hopefully, the job market hitting them in the face after graduation beats some liberal bullshit out of them.
Also, class warfare and money will always trump identity politics and all that social justice BS. If there's anything the US can get behind it's their hatred of the poor (yes, well-off left are just as guilty of this, just more implicitly)