Hmmm, well when I lived in France when I was 5 I had a pretty a hellish experience in school. My mother couldn't find any English speaking schools for me to go to, IIRC the only one she could find was a hideously expensive private school. So she did the next best thing and found me a French teacher that spoke good English who could teach me French, the thing was this teacher had a rather brutal way of trying to teach me, she would stop lessons and grill me in front of the whole class with questions, and if I ever responded in English, or with the wrong French, she would hit me with her ruler and tell me the right words.
Then there were the other kids... the other kids in that class seriously hated me, and the teacher tended to let the class go out to break with absolutely no supervision while she went to eat lunch (it was a pretty small school as I remember it, only a few classrooms, and they cycled using the playground), the kids basically liked to lynch me for amusement, I have a lot of blurry memories of being surrounded by kids who were hitting me, and being squashed by the weight several of them. I took to climbing up the tree as soon as the break started, and would only climb down when the rest of the kids were inside.
Then when we moved back to the UK, I had a much older bully who explicitly singled me out and decided to make my life miserable, for... I'm really not sure why, I think it was something to do with being able to speak French, but maybe that was just an excuse?
He basically like kicking the crap out of me too, and did a lot of vindictive and manipulative stuff, like trying to coerce other kids into isolating me with threats of violence, spreading a lot of lies, and of course the old fashioned randomly attacking me and then telling the teachers that I'd started attacking him and he was just defending himself...
The teachers actually mostly sided with him to start with, apparently he'd always been very well behaved up until he'd randomly started getting into fights with a much younger student in his last two years. He may have had some abusive father issues from what I heard, I don't know.
Then because of these experiences I spent the next several years often violently fighting against going to school because it was an activity I associated with a lot of bad things... but then things got better when I went to a special needs school in the Netherlands that... basically did everything right. They didn't give in and send me home or anything when I threw temper tantrums, and they just... generally did a good job of trying to cater to what I needed rather than what I wanted, it was effective.
I don't think I had any real bad experiences from then on, after I graduated that school and went on to Dutch high school which sucked, then we moved to the States, and barring one or two incidents I generally never got in any fights with anyone. I think the worst thing that happened was when one guy I'd been helping with his math he errr... well, I wouldn't let him copy my math work... he was doing the annoying, "please show me how to do problem 1... oh great, could you show me 2 as well?... how about 3?", thing. Then when I called him out on this and said he really needed to do the work himself because he needs the practice, he stood up at the end of class and shouted to his friend rather loudly "Hey <friend's name>, you know how smart <Pnx> is? He's so smart right? And he thinks he's so much better than everyone else, I could really see how someone could just walk up and shoot him, I mean really just get a gun and shoot him... I mean I wouldn't, but I could totally see that happening to him, right? I think something like that might happen to him soon."
It was kind of a shot to the gut because I spent ages working my butt off trying to teach him this stuff.
Them's my experiences, I don't know.