Well, that's the fundamental difference. Of course there's shitty art. I can make a recording of my own flatulence tuned to different pitches and claim that it moves me more than a Chopin sonata, but it's absurd to claim that my work would be equal to or greater than his.
Of course there are snooty and obnoxious and uninformed critics, but don't act like since experiencing art is personal everyone is equally informed about it and is just as qualified to judge it. There are plenty of people who don't know shit about music, and as a result we get crappy music that's really popular.