So, did you hear about the 5-year-old who got voted out of his class?
The boy in question is, according to him mother, in the process of being diagnosed with Asperger’s, which is a high-functioning form of autism. The Asperger syndrome itself has a range from low-functioning to high-functioning, which generally describes how socially, physically, and cognitively coordinated the subject is. I happen to have two friends with Aspergers right now, both of whom are fairly high functioning, though they still have to interpret many social signals cognitively. What helps kids like that is patient feedback, such as explanations of (among other things) why other kids might find their behavior disruptive and unnerving, and how to act differently and interpret social signals.
What does not help is having the majority of a classroom express such feedback in a horribly humiliating session of “Tell Alex why you don’t like him,” which is what his teacher did. She has since been transfered; further punishment is currently up in the air.
If you have a student in classes with you who tends to rub people wrong and get in fights, try finding a moment just before conflict, when you see it coming, and head it off by explaining, in clear language, why you would have chosen to act differently. What input you took note of to come to that conclusion. What rules and social mores were at work in your head. Thinking about things that way might even be interesting to you. I had a friend in middle school who had fought a lot before he joined my class. I remember one day being surprised that he did not understand the basic concept of the social contract - of picking up after yourself because you hope someone else will do the same for your environment if they spill something, and because spills - of drinks, of a packet of pens, whatever - can be dangerous if left unattended to.
The person in question may not welcome your input. But then again you might be surprised. My friend started picking up on notions of social utility. He still bugged other people (especially for the month or so when he found it hilarious the way some girls would get upset just because he stood near them - social psychology and personal space at work) but he didn’t get in fistfights any more.
Try talking things out, and your whole school experience could become more interesting and less violent and disrupted. Try not to be mean about it. Let them know you want the best for them as well as yourself. Mean it. Talk hard.