Most people are physically aware of themselves: they know what they look like on the surface. So they then judge everyone else by that very same standard without realising what goes on under our skin. Whenever a person differs from the rest of the crowd, it is difficult to reach an instant judgement on the person, so the populace will conjure up a label for the person and throw him out to the garbage.
'Different' people often have different motivations and orientations. Their motives are never the same as the crowd's. When a 'different' person happens to be an artist, that person often feels the urge to go into the 'prohibited' zones of the human psyche with his art. Society instantly feels repelled by this subversion, and applies their judgement on the person. The artist's intentions gets lost amidst the tumultuous controversy and he gets misunderstood.
Society always has norms, conventions and standards which are then imposed over the individual. When the individual's mind-set doesn't correlate with this specific ideology of the prevailing fashion, the individual stands out. Whatever his intentions are, they will always be scrutinised and laughed upon.
And what's sad and pathetic about all this is that people who are subject of this 'dismissal' from society often attempt to hide their idiosyncrasies and will do nothing about getting ostracized. All these new, exciting tendencies they experience are suppressed so that they can be part of the crowd or at the very least (in the most extreme cases of the eccentricity of the individual) obtain a couple of friends.