The rotten fruit of "If you see something, say something", even if it's a twirling pencil. Zero tolerance!
Sounds like the [shouting] kid was joking around, illustrating absurdity by being absurd, but discovered that the sociopathic thugs running the school [into the ground] take "absurd" to a whole nuther level of criminal absurdity.
Maybe the kid who tattled was SWATting him (the modern thing where someone calls 911 against another home “dangerous assault in action” or something and then watches them get hassled by police).
Get as many parents as possible to go to the next School Board Meeting, then tell them to expunge the kids record of any wrongdoing, and fire the “sociopathic thugs running the school”, or recall petitions against the lot of them will be started immediately.