I've been teaching undergrads for 3 years now, and while I try to avoid getting them to discuss things in an explicitly partisan framework, it's been pretty clear to me so far that the vast majority of them are either standard-issue liberal Democrats or moderates who are probably still figuring themselves out. I can't think of a single student who fits the stereotype of the alt-right Shapiro fanboy.
I've been working for a public school district for almost two years and, while there
are a few alt-right troll types in the high school, they're vastly outnumbered and I get the exact same vibe from them that I got from my own "lol epic pedobear bacon longcat goatse" high school classmates in 2008, most of whom, a decade later, are generic late-Millennial progressives.