Thanks ladies. I can try some more role playing and practice saying "Stop it". No chance of martial arts around here (small town) but it is a good idea.

Snacks, he goes to kindy 4 half days every week. He seems to have no problem at all with the other kids until they get rough. I hope that he just learns to deal with it like your DD did.

Esme, it is really hard seeing them picked on. It makes me wonder how many times it has happened when I wasn't there to help him

MD, I think he moves away and tells me if he can, but if they are physically rough he seems to freeze and doesn't say anything or think to move away - like if he stays still enough they will leave him alone.