The funny thing is this little debate about whether it’s possible for art to be objectively bad or not has an objective answer: It’s not.
You must be a big fan of actual shit on a canvas. I’m sure you find it profound, inspiring, and beautiful.
How many do you own? And how do you handle the smell?
None of these stupid analogies change anything. You’re missing the point entirely. It doesn’t matter what you or I think about it. Because art by its very definition is subjective and everyone has their own standards for judging its value, it is literally impossible to claim some art is objectively “better” than others. You can critique it all you want, argue about it, explain why according to your own standards you think it is good or bad, and that’s fine. But at the end of the day, no matter how well-supported and rational it may be, it is still your opinion. Not some kind of hard fact.