H.G.
Hello J.,
Although my son (10 yo)does not have Tourette's he does have ADHD. His problem is that he doesn't instictively know how to interact with other kids and they seize that as a weakness and give him a rough time. Like your son, my son comes home sad and depressed over the fact that he has no friends and that the kids were mean. We recently found "Theraplay". There is a location in Limerick - not sure where there are others. Look them up on the internet. They offer classes and group sessions to help kids "learn" social interaction. In addition, there is a speach therapist at school that is assisting him with social interaction skills. This might be something you can find at your school.
It's rough and I feel for you. One other thought is the local CHADD group. They can be a huge resource for you.
Good luck!