TV, which might seem hypocritical considering I'm a rabid follower of MLP. Other than that, I hate any Rap or Pop music that's been made in the past 15 years, barring a few exceptions.
Also, 'name brand' headphones/accessories. Ugg, Beats, Soul, etc etc. It's all overpriced and ugly as hell. I paid $40 for my Razer Electras and they're better than Beats, if not as 'cool'.
Damn high school kids these days...