Most things produced by AI and assisted by AI are still human creation, as it requires a human to guide it to what it's making. Human innovation is also very much based on mixing materials it's seen before in new creative manners. Almost no material is truly innovative. Ask any honest artists about their inspirations and they can tell you what parts of their creations were inspired by what. Our world has explored the depths of most art forms so there is more than a lifetime's worth of art to mix and match. Often the real reason things feel fresh and new is because they are fresh and new to us, but already existed in some form out there before it came to our attention.

That AI can match this is easily proven by fact AI can create material that no human would realistically make (like AI generated QR codes, or 'cursed' AI), very proficient style mixing that would take a human extensive study of both styles to pull off (eg. Pokemon and real life), or real looking images that could not realistically, financially, conscionably, be made using normal methods (eg. A bus full of greek marble statues).

Nobody is saying you have to like AI art, and depending on your perspective, some or most of it will still be really low effort and not worth paying attention to, but that was already the state of art before AI. Lifetimes of art are being uploaded very day, but nobody has the time to view it all. So I would really keep an open mind that good AI art and AI assisted art exists out there, and you might one day come to like it but not realize you're seeing it, because good AI usage is indistinguishable from normal art.