LOL So I am half right.
My only point of disagreement would be that it's usually not the kids who have only been here a few weeks that act that way. They come from places where teachers can still beat your butt for that kind of behavior. It's the ones who have been here since they were very small who have come to the realization that there are no repercussions for what they do.
Even their parents can't control them, because the little darlings tell their illegal parents that if they try to discipline them, little darling will call the police. The parents are cowed. It's pretty bad.