What if I told you that I used to listen to KoRn?
KoRn is a nu-metal band, which is generally considered a mix between rap and metal (which comes from rock)
And what if I told you I like some of their newer work,
such as their collaboration with Skrillex? That would mean that I like
rock, rap and dubstep. !!! :O
But seriously, differentiating between genres doesn't make much sense. Some bands are influenced by a lot of different sounds, and it's rare to find a "pure" rock band.
Each genre has its pros and cons. Some artists are bad, others are good. Just because I like rock (and metal) doesnt mean I like hair/glam metal or deathcore. I also find some of the earlier rock bands boring, even though I generally like the genre.
If I had to choose the one genre that most of the songs on my iPod could (to some extent) be categorized under, it would have to be rock.
(But classical music is superior to all of these :P)