I think people disliked being fooled. Something seems good and true, and then you realize it was ChatGPT, and you realize it’s all fake. The connection you were forming with the author is gone (because they phoned it in) and the sense of truth is gone (because who knows what was hallucinated).
Another thing that isn't authentic is anything said in public by a celebrity - or worse - the feelings they show in their work. Yet people still lap it up. I think people enjoy being fooled into believing something is authentic in some cases but not others. Not sure what distinguishes them though.
People like authenticity. ChatGPT ain’t it.