wakeride -- For casual listeners who only listen to music now and then for background entertainment the argument about cultural setting holds true (no sense in hearing new things if you don't really care about music anyway), but for people like us -- who invest lots of time and money into improving our music enrichment -- I think we're cheating ourselves if we don't find ways to crush those cultural constrictions.
I was afflicted with "rap is crap" syndrome for much of my childhood life but when music piracy exploded into the big time I got exposed to way more of it and stumbled upon things I actually liked, which transformed me so that now I like a lot of the stuff I wouldn't even give a chance before. I also grew up never hearing any country and thought it was for rednecks only, and later in my life I saw this as a problem so I went searching for a touchpoint and I found it in Johnny Cash and am currently looking to dig deeper. I knew nothing of jazz and was generally bored by its directionless noodling, so I had my friend recommend me albums until I found a touchpoint in Chuck Mingus, and gradually I became a jazz fan. Classical music seemed like a dense jungle of snobbery to me until just a few weeks ago when I let Kraftwerk's tribute track "Franz Schubert" lead me to Schubert himself, whose music I found out I really enjoy, and now I'm really excited about the prospects ahead. Always was bored by reggae but I found out I totally dig rocksteady. And I've even taken some blind stabs at getting into world music with some Gamelan and some traditional Chinese. Hell, by now I've even found touchpoints in American Top 40 pop music, something I NEVER thought I'd dig.
If I had stayed true to the idea that peoples' cultural backgrounds just make it near-impossible for them to see certain types of music as anything but weird, boring, offensive, or otherwise not worthwhile, I can't even imagine the musical enjoyment I'd be missing.