There was a size disparity there of a similar nature (although it was more like 130 vs 90 at that age most likely) with two different guys I dealt with in middle school who were just constant with the random hitting/slapping (their favorite)/other annoying/embarrassing things.
Once I got a warning (I literally dented a gym locker with his head, to the coaches amusement), the other time an in school suspension (picked up kid, threw into chalkboard), but both stopped the harassment. The other kid may have been punished too, but don't honestly care: As they were then leery of me, I was then no longer constantly harassed by them. The point isn't to "win" by getting them punished by the administration and reforming them from their bullying ways; it's to assert "I am not the lowest status guy, go find someone else to screw with"
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