It's mostly coming from troon- and troon-worshipping communities, people who are used to denying reality and who don't have a very good track record of predicting the future.
In my experience, the angriest anti-AI seethers happen to be the same people who thought that Twitter was going to collapse back in 2022, who were very cock-sure and arrogant about Kamala winning in 2024, and who thought that the UK would actually significantly improve with the Tories out of government. Unsurprisingly, none of these predictions have come to pass.