This culture likes to make products for a wide range of individuals, and so reap profits. The best way to do this obviously is to appeal to the lowest common denominator in function, while making something unique in appearance.
Several great writers and thinkers have classified their youthful years as solipsistic, meaning in the vernacular extreme egocentricity. "I wasn't aware that others existed," said one, and this correlates to my own experience, although being a nihilist I think less in terms of "others" and more in terms of a continuous whole.
Most of my friends were the same way. We were more concerned with what CD we were going to buy/play, that night's party, what we were going to eat and other things... the domain of the ego, the self, and really not that interesting once you've experienced it for a dozen years. I've seen this phenomenon in most of the people who come through this site, and I think it's a convergence of several factors:
1. Massive propaganda to make you selfish to make you a good consumer/voter;
2. Natural tendency of those inexperienced in life to be self-referential. For most people, awareness of others as independent entities starts in the fourth grade. Sometime around the sophomore year of high school, they also become aware not only of others but of the "perception layer" of others. It's usually only after college (if lucky enough to go) that they become independent of that, and only partially.
3. We are united here by what most will see as a personal preference, a musical style.
The only solution is to observe the obvious: that music is a conveyance of ideas, and that those ideas define how the music sounds and who likes it. We are here for an idea. At that point, solipsism becomes an excuse and not an action item.