Using the bathroom required permission that was often denied. Peeing between classes often meant penalties for being tardy (in middle/high school where you had 5 minutes to get between classes which may be a 4 minute walk apart, and teachers always had that one last thing to say). My middle school banned shoelaces for a while because of gang violence. I had a Spanish teacher who regularly handed out negative grades on tests (your grade would have been better if you hadn't showed up and taken a 0 on the test). I had a different spanish teacher who took it upon herself to regularly humiliate students who were doing poorly and lecture us about how we could never expect to get anywhere in life.
It wasn't all bad. I had a fantastic chemistry teacher and a great physics teacher. But there was a lot of bad.