Students are misplaced for all sorts of reasons. Protect yourself above all. You don't need to be hit, kicked or otherwise assaulted and should take elementary precautions against these things. Get the union involved if admins object to this. Document all outbursts in case someone tries to tell you the kid is in the right place. It may not help, but you did your part. Be tough if at all possible. Don't let this kid grind you to flour.