I'm just kidding.
Kids that do stuff like that really strike a nerve with me. Growing up I was a bit chubby and have been picked on so I know how he feels. I however toughened up, dealt with it and now I know how to handle it when people in the real life are douche bags.
People are going to be dicks to you no matter where you are and that's where that nice mug of concrete comes in. Deal with it and move on.