This movie is pretty much a "satire" on dumb people for people who aren't too smart themselves but like to think they are.
Alternatively, it's for people not bright enough to realize that Beavis and Butthead already satirized the same points much better without coming across as the whiny slacker nerd complaining how all the stupids in highschool are keeping them down.
To be really great, dumb comedy needs to be smarter than this. I once heard a joke from Gracie Allen that blew my mind with incredibly sophisticated abstract reasoning. (Wish I could remember how it went.) Mike Judge doesn't do smart dumb. In the Beavis and Butthead movie, which I liked okay, B&B were the least funny things in the film, with Beavis (Or maybe it was the other one) walking around for ten minutes saying that he needs TP for his bunghole.