Most teachers are on a power trip, they are literally public servants, and hardly act that way. Why does a teacher need a bachelor's degree to teach elementary math? Also, when was the last time students got to grade the teacher? It should be mandatory, after every subject is taught, that students critique the instructor (in writing), and reviewed by the principal, before the teacher is allowed to teach again. It would end much of the abuse, or at least have records of it. Teacher unions has teachers sitting doing nothing and getting paid, when they should be fired.
Anyways, I blame the school system, more than the students, or teachers.