That's a bad comparison, because conducting is actually a skill, "making a Mondrian" isn't. Anyone can do it. As long as it's then hung in a museum with a plaque that says "Mondrian", everyone will stare at it and go "mhhh, ah, yey, yes, amazing".

The greatest trick that the art community played on the world is getting incredibly lazy, and making people believe that they "just don't get good art" if they voice displeasure with their colored lines and crayon squiggles.

I prefer a more "Emperor has no clothes" approach to this.