Man, I pissed off my high school biology teacher.
So, he was an asshole anyway, but he did give good lecture. I took notes, which was part of his rules. He walked around the class doing his talk, expanding points after questions, etc. So, an asshole, but a decent teacher.
Until he strolled by me one day. I have my own shorthand that I built up over the years of being dyslexic and a few other issues. No teacher had ever given a shit about it before.
But he flipped shit, said I was just scribbling, to take real notes.
I said I was, he basically said bullshit, and turned back three pages and asked what it said "smart alex" (that's a quote).
So, I took a look at it, and read back what it said, which was what he had said in class, and it was easy to confirm because other students had the same thing.
He told me to write normal. I said no. Shit flipped, and it was a thing, and the principal ended up siding with me. Strangely, my grades in that class went from As to Cs and Ds, funny that.
What's worse, if he had checked with my English teacher, or math teacher, or anyone else at all, he would have known my handwriting was shit, and the shorthand was more useful.