I feel for your son. I was in the same position as he was. This might be callous to say, but if he is encountering the same peer rejection as I was it might be in your best interest to find another school or home school him. Students may not also be ignoring him, but bullying him as a result. Being the target of such will lead to very maladaptive behaviors latter on. Its not uncommon for such kids to go from free spirited and friendly to bitter and explosive. In any case social networking with other gifted individuals is essential.