i can definitely see why someone would dislike them...if you don't like this kind of music, you won't like grizzly bear...they're a very hit-or-miss band, and they're inevitably going to be polarizing. they're one of my favorite bands, for example, and both of their latest albums took a few spins to really sink into me.
also, if someone were to hear them for the first time and say something like, "they're a bunch of elitist, pretentious, indie hipsters who think they can play 4 or 5 random dissonant chords and call the song artsy," i wouldn't have much to say in response except to listen about 20 more times and try to enjoy them. they appeal to people with very certain tastes. once again, i love them and i am extremely excited to see them on wednesday, but grizzly bear is certainly not for everyone.