Because the existing cultural understanding of art is that someone took the time to create what you’re experiencing. AI generated “art” subverts that expectation. It feels deceptive. Honestly it reminds of Duchamp’s Fountain and similar works, which some people hated for more or less the same reason.

I am not equating AI slop with Marcel Duchamp, however. His work and what he did was very much intentional to evoke the sort of reactions it did.