I'm english, and in my experience it's more to do with how people act. The stereotypes here are much broader and relaxed, and so if someone is disliked it's for who they are personally.
I haven't been to america, let alone schooled there, but from the media it does seem like the stereotypes are more rigid and that you must become part of one and conform to its "rules" to, for lack of a better word - survive. Obviously this might be complete fairytale ravings, but that's the impression outsiders get of american school culture.
I played rugby for the school, also represented it in athletics and football. Had good grades. Also played Warhammer 40k and was part of the schools "Games Society". Got plastered on a weekly basis (with people from all these different social circles in the same place) whether forged ID was accepted or not. Played a lot of video games and read alot as well, but I'm here so you've guessed that part. I do not think I'd have been able to do this if I'd been in america, at least without being hated by some of the stereotypical groups or becoming outcast from them all.
I'll stop there, I don't know enough to make more judgements than I already have.
Edit: Obviously we do have bullies here, but they are not stereotypically part of any social group. Could be jock, nerd, goth etc. Groups of bullies here are just that, bullies, they're not normally particularly good at anything other than being an arse and and general c*nt to other people. They'd be hated by the rest of the school, but accepted as part of it because bullying is an unfortunate part of schools and growing up.
I'd gone to an all boys school, with a girls school across the road. This meant that during school there was little to no bullying (no girls to "impress") while after school and at bus stops/on buses is where most bullying took place. Only during sixth form (17-18) were girls admitted to our school, and by then everyone had matured enough to get along no matter the differences.
Perhaps that's a post for another thread, how we are expected to mature and given responsibilites at 18, and are considered adult. Whereas americans are considered, I hesitate to say this, children until 21.