...in middle school, I was a metalhead who refused to see the value in any genre that didn't feature distorted, blistering guitar solos. I grew out of that phase around age 15. Being 30 now, I can confidently say I enjoy music of every major genre. I'm still primarily a metal fan, but I'm not opposed to some bluegrass (which could technically be considered "country"), actual 70s R&B, some late 70s-early 80s rap, and a lot of modern techno... including some trance(dance/rave genre covered).
Those are my most extremely deviant examples. I'm also a huge fan of classic rock (which could be considered early 70s pop music, another genre covered), grunge, modern alt rock, hardcore punk, classical symphony (Sergei Rachmaninoff is the great-great grandfather of speed metal), modern symphony, and industrial.