This is not about stereotyping as much as it is blind and willful scapegoating instead of addressing the problem sensibly.
Once he had hastily drawn his scapegoat, he wasted energy lambasting this creation, working himself up into a frenzy instead of stepping back to think:
1. hey, these guys are jerks, no NT ways about it. There's nothing "NT" about trashing a book you're studying without taking more than a cursory look at it, or lacking insight into the human mind :rolli:. And there's nothing NT about slinging racial slurs around. This is BS.
2. Maybe I should should prepare my thoughts so I can respond well to useful criticism. That way I can get better at this and perhaps make them think
3. Maybe the teacher needs to get in control of a class of rowdy, cocky teenagers who sideline discussion with useless criticism