Speaking specifically of the nut's stereotypical hatred for school kids in sport coats and khakis, I can speak from experience, having gone to a Catholic school myself, that some people, observably, hold some kind of weird, bent up contempt toward them for whatever odd reason.
I've even observed some consume time and space to openly express that brand of antagonistic contempt towards Catholic school students on here as of late. Those, too, tend to do so while simultaneously raising an arbitrary victim status card.
Anyway. Best education I received, though. Heck. By the time I got to High School, I was so far ahead of the students who had done all of their time in the public education system that I didn't even have to try. Perhaps that might have something to do with the sort of contempt that some are known to hold and demonstrate toward those kids in particular. I dunno. I suppose its not just the mentally ill like the twisted Individual referenced in the OP who are eager to demonstrate that targeted brand of hatred/contempt toward that specific demograph. Jealousy perhaps? Could be a lot of things...