My first thoughts are, is he diagnosed with a disablility? I just ask that first because there are many ways about tackling the issue. If he is aspergers/autistic... I would recommend social cue intervention and reinforcers a long with a talk to teachers/adminstration about his specific issue he is having with the other children at school. I primarily work with Spec. Ed. children. Another thing I would recommend is if he has never been diagnosed with anything, you can teach him the acceptable way to socialize with his peers. If these kids are older, and they are doing this, it just needs to be stopped and recognized by the other parents/teachers. I can recommend ideas from here, I know that being a Mom is the hardest job in the world, i have three myself.

how do i help my 6year old learn how to become socially accepted without using bad behavior to get the attention from his peers. when other kids talk to him he thinks they are his friends when he does bad things that they get him to do. they are actually just getting him to do things that get him in trouble. it saddens me that kids can be so cruel. when he ends up reacting to other kids he is usually the one who gets in trouble at school.