Interesting, and I think your prof's observations about misogyny and racism are spot-on, sadly.

Of course, classism is trickier because it's not easy to separate it from elitism -- and that's something not just built into but actively furthered in US society especially. (I personally think that while the elitism is far less pronounced, Germany's classism is stronger than that in the US, only that for decades the middle class was so large and dominant that this wasn't visible.)