Whether people know it or not, when they engage with art they are assuming a person not just made it but experienced it. I'm going to blow past the discussion of "what is art" here, but where something came from and how it was made has always mattered to me (you could draw parallels to food here if you wanted). One thing that has been on my mind a lot is a particular photograph I saw in the past few years (and I'm sure it's easy to find online): it's a POV shot taken by a person sitting atop a skyscraper with their feet dangling over the edge. There is just no way that anyone could in good faith claim that the same photo produced by "AI" could possibly have the same emotional impact as knowing someone actually went and did that. I think that for a lot of people they may not even realize that when hey see a painting or even a photo as innocuous as a tree, their mind goes to that the person who produced this went to this that place the tree was in an had an experience and chose to document that particular perspective. If they were to see a painting or drawing of something that is clearly "fantasy," they know that a person made this up in their crazy mind and experience their feelings on it (good or bad). "AI" (heavy quotes) is trying to trick us and rob of us this basic knowledge. Some see this as progress. I personally think it's fucking disgusting, but I've been wrong before.

Of course this has always been a bit of a problem with digital art trying to mascarade as the real thing... I always think of programmed drums using real drum samples. In my adult life I found out that an album I loved as a teenager that listed a real drummer as the performer was actually 100% programmed (this was an otherwise very "organic" sounding heavy guitar album). I always had my suspicions since it was so perfect but I experienced exactly what you are describing. I also never got over it.