I don't think that's the right takeaway. I think the bigger issue is that we let kids create their own social structure in schools (in the US) where in-group o

I don't think that's the right takeaway. I think the bigger issue is that we let kids create their own social structure in schools (in the US) where in-group out-group dynamics include bullying over what color your texts are, what clothes you are wearing, what songs you listen to... etc. School culture should be about academic achievement, and controlled and led by teachers. It works that way in other schools systems. Grown ups actually place limits on bad behaviors of children, with the full support of parents. In this case, that might mean not giving kids personal multimedia devices, and not permitting their use on school grounds at all.