I agree with Austin. Could this g&t program cater to the moderately gifted only, leaving your son needing more? Second grade seems to be when peer ostracization starts. I'm afraid that this could become worse for him if teachers and staff are not on the lookout for the taunting. The acting out could be his expression of frustration and anger from an environment that's wrong for him. In the meantime, if he can acquire skills to bounce the taunts off that might help. A counselor might be in order and they can be advocates with you at meetings.