People have different reasons for listening to music and different tastes. I know alot of academically smart people who listen to ganster rap, techno, and the other dumb, mind-numbing music. I guess, when you're so intelligen, you kinda get bored with all things smart, so logically as far as music goes, rap and certain techno will offer them the stupidity they want.
But for a more general response to the topic, I've let my friends listen to Opeth, but judging from their lukewarm response, they don't really get it. It's understandable. Everything they listen to is controlled by the airwaves, TV, and the mainstream society. I don't even bother anymore. At least, I get to be the one with good taste in music...
I did, however, turn the attention of my cousin from just techno, to include prog-metal, like Dream Theater. I made him listen to Opeth, but clearly he wasn't 'ready' for them yet. I used the word 'ready' becuase that's what he told me. He knew by the way I describe Opeth that it must be really good music. So in other words, he basically implies that he's not worthy of appreciating Opeth yet. Damn, talk about respect.