I have a similar story
I remember in the 7th grade in art class we were doing some kinda work. I got done and went to the teacher and told him "I'm done". He responds with "You're dumb?". I was confused but said "Sorry I meant I'm finished". He took my drawing and then told me to sit at the corner for calling myself dumb. I sat there for like 5 minutes then he told me to go back to my seat.
He did this to other students too and to this day I have no clue why he pressed on this. It's not like he's the English or grammar teache
r.