Originally Posted by Butters

I think you are confusing two things. Everyone is entitled to their opinion and should be able to express it without being attacked, however, questions about artistic beauty do permit of better and worse answers.

Michelangelo's David is a better sculpture (and piece of art) than some kid's attempt at making a clay ashtray. That is as factual a statement as saying the Earth is round. Now, the parent of the child who made the ashtray may prefer his or her kid's sculpture to Michelangelo's effort and that's fine. They may prefer one to the other, but there is a correct answer to which is better.

Steven Pinker's book The Blank Slate deals with this really well.