I'm going to play devil's advocate and say that the kid was probably a giant dick to everybody in the class, including the teacher, and he was going to be kicked out sooner or later.
More likely, since he is potential Asperger's, he just wouldn't work with the other kids or was very stubborn to do things his way. He probably wasn't really mean.
Originally Posted by Professor Plum
Now you're all starting to sound like some of the parents I work with. "I know my child completely disrupts your class on a regular basis, but you can't give him detention because he's ADHD/bipolar! WAAHH!"