I'd like to share the neoist definition of art:

Art is not genius' creation but rather practice of PR-activities.

The definition makes sense when you think about any established artist: Whatever the cunt does, it's of great value. Thus art is merely an expensive tag the cultural elite stamps on an esthetically classificable, consumable product. Situationists highlighted the absurdity of art industrializing the painting; by producing a painting that was tens of meters long and was sold like wallpapers, by meters. And when it actually turned out to be a commercial success they simply raised the price/meter.

One can also justly compare art to medicine: You dislike both but you should have your regular fix every now and then because they make you better person: Consumption of entertainment proves that you are culturally sick. Therefore you must eat doctor's (= art critic) order.