Lonny my DS us very much like that. Now his needs are being met he is such a gentle, loving little soul.
He was at the skate park once and this boy was taking the piss out of him for not being able to talk, following him round, screaming in his face and taking the piss out of the way he walks. The boys dad was there.
I said to the boys dad, your child is being really unkind, he needs telling, he did nothing, so I told him that DS was getting really wound up, but he just laughed.
I kept redirecting DS, the older boys at the park kept getting in the bullies way so he couldn't get near DS, anyway eventually DS turned around and punched him in the face.
Cue tears and the dad giving me evils.
Obviously I could not let my DS think it was ok to lash out, but I also didn't want him to think it was ok for him to be tormented. So I said "no DS, we don't hit bullies, we come to mum"
Bullies dad then tried to slag DS off to other parents who just said "well, maybe your child will learn not to bully disabled children now"