Genre rivalries have got strangely violent in Mexico, where riot police have been brought in to defend groups of emo fans who were being attacked, seemingly by groups who adopt other music preferences such as punk, metal and rockabilly.
How much the genre preferences are the cause of the violence, and how much the music choices are merely representative of the backgrounds of rival social groups I'm not sure, but this is being very much spun as a war against emo kids in the Mexican press and elsewhere.
The sudden rise in violence against emo fans - who are, obviously, generally quite easy to pick out in a crowd given the fashion dimension of the scene - is possibly in part down to an on air rant by a high profile TV personality in the country who called emo "fucking bullshit". Since then violent attacks against emo fans have been reported in both Querataro and Mexico City. Emo fans have responded by staging a peaceful march in the two cities. Similar attacks on emo fans have also been reported in Chile.