How is the question framed, then? Either everyone's aesthetic judgement is equally valid, or there are some judgments that are better than others. I'm intereste

How is the question framed, then? Either everyone's aesthetic judgement is equally valid, or there are some judgments that are better than others. I'm interested in the defense of the latter position. By what reasoning can an aesthetician convince me that Bach is better (in some, in any way) than Harry Potter? Or if that's not the right question either: by what reasoning can an aesthetician argue that a particular interpretation or assignment of value is better than another? Yes, I arrived at my position out of ignorance, but I've had this kind of argument online before, and nobody has been able to offer me an argument for the side which says we can arrive at value judgments about art that are independent of the person, or whatever the opposite opinion to "art is subjective" is supposed to be.