Replying to Kid cussed out student teacher today

Heres the scenario, our new student teacher teaches our class alone and is an older guy with sweaty pits. Our class is obnoxious and he had someone observe his yesterday who gave him a bad grade i guess. I was surprised this kid is really funny and calm.

Teacher: What do you think that the behavior in this class is like?

Kid:EXCELLENT

T:You really think its excellent?

K: No I was being sarcastic

T: Dont use sarcasm

K:(calmly) well fuck you then

T: you have detention at 2:20 today

K: Fuck you Im not fucking coming, you fucking pig

The teacher calls the office as the kid sits their and spells his name for him and continues to yell at the teacher. The kid yells as hes leaving, "I HOPE YOU HAVE A NICE FUCKING DAY CHARLIE!"

its not the first time either, once he got mad and flipped a tray of pasta on the lunch table and a teacher tried to give his office detention. So he told her to go fuck herself.