I agree Tyler, it is NOT the teachers place to teach respect, the kids should have that when they walk into school already, but when I was young and in school there was always a handfull that wanted to be hard asses, and if some can get away with doing whatever they want, sooner or later the tag along kids are doing the same thing, IF the teachers cant show the children under her/his care that THEY run the class, not the bad children.
Theres nothing like knowing you can get an ass beating at school, and then get one when you go home too.