Cultural Marxism is a Jewish movement which began in the early 20th century. It was developed for the single purpose of attacking the Western World by bringing about depraved cultural change to the West. One aspect of Cultural Marxism is the subversion (and perversion) of all Western cultural institutions (e.g., art, film, music, theatre, etc) in order to help cause Western societies to rot from within.
In the early 20th century, so-called "Modern Art" came into existence. Talent was no longer a requirement to be an artist. One simply had to randomly slop anything on a canvas and describe the "painting" in grandiose and esoteric terms... i.e., explaining the "deep" meaning of the "art." Anyone who dared criticize the so-called "painting" was labeled "backward" and a "simpleton."
For more on how Jews have subverted the art world, read this article in the Occidental Observer.