My school's policies around stuff like this were amusing.
In general, it went something like this at the high school level...
Spitting on someone or putting your gum on them would get you a lecture and a couple days of detention.
Getting spit on or having someone put your gum gets you a bunch of questions and having to sit through that lecture too.
Punching someone gets you three day suspension.
Getting punched gets you a three day suspension.
An actual fight gets all people fighting a four to six day suspension.
Video taping the fight would get your device confiscated and possibly in trouble with the cops for "contributing to harm of minors" or something like that.
If the people fighting or the people involved in the punching and getting punched said that they were okay now, then there was no punishment at all besides a stern lecture.
My school also decided that self injurers were dangerous to others and needed to be suspended from school. One of my friends, along with five other people, had to argue with the school for days. Apperently the expert advice of the school nurse decided that self injurers would be the next school shooters.
Also there was a kid in our school that every single student expected him to turn out to be the next school shooter. He never had any friends, not because he was bullied or for any reason beyond he did not want any. He was in middle school drawing pictures during class of people being hung and shot with random notes about how to do such things and get away with it. He was never once questioned by the school or anything, even though teachers saw his drawings. He did stuff like this in art class too.
Meanwhile, I got questioned by my guidance counselor in middle school for drawing a longsword, accompanied by armor and a shield, besides my English class notes.