As somebody from Europe, we always see these typical American High Schools and think it can really be like this. Sure they overdo it in movies but I have read a fair amount of blogpost and reddit comments that discribe the same problem.
There is grouping and groupe think too in Schools here but not in the same extrem way. It could be selection bios on my part but lets look at the diffrents in the schooling system.
In Switzerland (most parts) we have 1-2 years of Kindergarden, 6 years of Elementry School and then the people get split up in 3 diffrent section depending on your grade. The lower to only take 3 more years and after them mandatory school is finished and most people start an profecional education via the Dual Education System (http://en.wikipedia.org/wiki/Dual_education_system). The other way is to go 6 more years and then most people go to a universety.
The good parts are that more often then not you put people to gather that go together. The typical movie example where the bull beats up the nerd doesnt really happen. The next positiv thing is that you put people together that are about equal in how fast they learn. The guy who always distracts the class will not hold back the guy who wants to learn. The studends get the matiral in there own speed, thus they don't feel stupid because of the fast learners, witch can be bad for confidence and it can cause social conflicts.
The bad is of course that you split up frindships because people go to diffrent schools and you just don't see each other that much anymore. This happend to me and only years later we really start hanging out again. Today kids are much better equiped to deal with this. To other bad thing is that often good studends could help the others.
It seams to me spliting up teenagers that are in puberty is good way to avoid social problems.
Other opinions why this problem seams worst in the US or is it just selection bias?