For example: If someone walks out into the wilderness and encounters a particularly fascinating rock formation or plant, something that was created completely by accident and without a artist or designer, but they find that the sight instills in them strong emotions or deeper thought, I believe they should be allowed to call that art.
Maybe this is just petty linguistics and semantics though, in which case we're drifting away from the topic at hand, and I'm sorry.
Unless the whole thing moves to a random AI generated slop stream app, whoever turns the knobs of the AI that creates the music will become the new "artist". Right now it doesn't seem like the AI creator "does" anything, but maybe future people will think that.
I believe that a lot of the judgement is also connected to the quality of the works. "Slop", while doubtlessly accurate for today, may be a rather weird description in a couple of year if the rate of progress continues to accelerate like it has.
Although I've already heard people starting to refer to DeviantArt and the like as full of "human slop" so perhaps this is just modern language that's evolving and completely unrelated to AI.