"Shitty" music is very popular here. By shitty music, I would mean: Everything I don't like.
So, in other words, shitty music is a relative term. However, since we all here (or at least most of us) like more or less the same kind of music (extreme metal), I'd say we can all agree that pop, emo, hip-hop, dance & disco, reggae, and ska are shitty music. Also, to a lesser extent, electronic music could be argued to be shitty music in our context, but quite a lot of people around here might still like it (Those
VNV Nation huggers, for instance).
Punk, Nu-Metal, Metalcore, Hardcore and Alternative Rock are in my opinion in a grey zone in which there's both low-quality music and good-quality music, though the latter can be difficult to find.
I would also like to classify everything that is popular in my country as shitty music, such as:
reggaeton,
banda,
norteño,
mariachi,
cumbia, guitar/voice trios, and any fusions of these genres with pop (which are also popular here, sadly).