When narrowmindedness is applied to music, the result is never good. There's a whole world of fantastic music out there. My son has introduced me to all kinds of great stuff I never would have heard. I have always tried to do the same for him, so it's fair enough.
So even though I love folk and blues, I appreciate quality in music wherever I find it.
Rock music is going through a renaissance these days, giving us more variety than at any time since the 60's. The extraordinary talents of bands like Tool impress the hell out of me. So does Faiz Ali Faiz, the Pakistani Sufi singer. Two rather different musical genres, but who cares? Both brilliant.
Just because you have a preference for folk music, should there be no room on your CD shelves for Aretha Franklin? Jimi Hendrix? Spike Jones? Beethoven? Django Reinhardt? We are lucky to be able to hear them. Soak it all up. Freak the neighbours with Frank Zappa on full volume while you leap around the room. Then go practice four-part harmonies with your bluegrass group. It's all music, and thank God for it.