It was not one school or one teacher.
Of course Canadians just want to pretend it was just one group they screwed with, I’m just simply pointing out that it was NOT an isolated thing that Canadian schools are pure trash.
My mother was left-handed and was forced to write, etc with her right hand by her Dutch teachers, as were all other lefties. Force included bloody knuckles from rulers wielded by teachers and other corporal punishments. I've heard similar stories from other lefties from other countries.
Schools were (are?) about teaching children to confirm as much as teaching them reading and math, etc - I think that was a pretty universal thing in previous generations. Just because your experience was in Canada doesn't mean there was anything specifically Canadian about it.