Art is subjective. If someone looks at it and says it's bad, they don't like it, they could do better, then just accept it and move on. No need to confront them. A lot of "artists" are producing garbage, and we shouldn't be protecting them or getting upset on their behalfs.

You can love or hate a piece of art, but if you claim you can do better, you should fucking try it and find out real quickly that you’re talking out of your ass hole