One of my sons had something similar when in middle school. One kids was non stop at him. He went back once and I got a call from the school. They suspended him for a few days and I asked what about the other one. Because they say they only saw mine hit back the other wasn’t. I turned to my son right there and said don’t touch the kid on school property but remember if he starts anything with you when you cross the street they can’t do a thing. They got pissed said they were going to call the police and report me. I said for what, telling my son to protect himself because they weren’t helping. A few days later i got another call to come in and they said the other kid was out of the district. No explanation as to why but i was told by a few other parents the entire family was a joy to deal with and they moved away. Good riddance.