[Oh lord. He's struggling between feeling amused and outraged that she's been made to do this when clearly she's only been looking out for herself. Where are the videos from the other children involved? And the insults...yeah no.]

You have every right to defend yourself against bullies. It just sounds like your problem might lay in excessive use of force. Throat punching someone with a backpack, for example, while effective, isn't usually necessary for someone being rude. [Although it depends on how rude. Still he has to try and be a good role model here.]

But if anyone ever threatens you with physical violence, you have my permission to use as much force as necessary.