He didn’t do me any real harm except to embarrass me I suppose.
Many might take the view that if you feel the need to write about it so many years later, then perhaps it did do you some real harm? It certainly seems to have left a lasting impression.
I remember my own PE teacher being an arrogant, irascible twenty-something who strutted about wearing his CCPR blazer as a status symbol. I still feel resentment that, having been sent by the headmaster to collect a book from a local shop, he accused me of lying and hiding in the toilets to get out of PE. I have a long memory when it comes to that kind of thing.