I don't have asperger's or behavioural problems, but I have tourette's. My tourette's started when I was 8, and it was SEVERE. I would get constantly made fun of and ostracized. Everyone would look at me like I was a freak, or ask me over and over again why I was flinging my arms and legs and head around like a crazy person.

Advice? Get the parents to talk to the teacher. The teacher should put an hour aside in the class to talk to all the students about what Tourette's disorder is, and explain that someone with tourette's doesn't have control over the tics. The teacher should allow students to ask questions about tics (e.g. is it contagious? is it dangerous?) and then make it clear that anyone who makes fun of the child for his tics will get into trouble. The teacher can also send a letter home to the parents of all the children in the class explaining that a child in the class has tourette's syndrome, and asking the parents to talk to their kids about the disorder, and make sure that their kids don't bully the kid in question.

Finally, if the tics are really that bad that they are bothering the child, you could try medications. Clonidine is a good place to start, as it has few side effects.