I agree that art can be divided into Objective and Subjective. Objective art is intentionally created to convey specific emotional information to other people or to future generations. It will not affect all people the same, but rather all people of a similar level of development. Persons of differing levels of development will experience different emotional truths in the piece of objective art.

I do not criticize "subjective" art as harshly as you do. It can be the attempt of the creators of the art to externalize, for others to view or for their own edification, the contents of their inner world. And thus has the potential to give material for attaining knowledge or growth. But it certainly can be much less than that - and virtually without value to anyone, even the "artist".