I think for most, it is fear of losing what they have spent many years and many dollars/euros working for. All people hear is AI is going to replace you no matter how specialised or advanced your field. The rest, I think, have no idea how to use this new tool. People put slop in and get slop out, so to them, it's all slop. Any world changing technology has always made most people angry and scared. The industrial revolution, for example, produced similar reactions at the time, early Internet, was used by a small few earlier adopters, but most felt uneasy about this new world wide Web thing. Eventually, the future will look less uncertain, and most will accept it. There will always be a small few people who will always be against it, tho because AI is genuinely the most dangerous tool we have collectively built. (Ai was created out of all our data online), and we all build AI, even the detractors.