This is the thing that gives me hope -- inquisitive people who have no idea how ChatGPT does what it does can point out ChatGPT-generated text. It's more difficult with GAN-generated images but in the creative community I am part of, some people are very literate about this already.
But quite a lot of people understand the difference, at a visceral level, between a painting made by an individual amateur artist and a painting made for selling at one of those Fine Art chains, or the difference between something rough and charming and a painting you might have seen in the 90s while trying to locate the loo in a UK branch of McDonalds.
People's instinctive artistic "literacy" is often surprising.