If art is subjective, why do so many say AI art isn’t ‘real’ art?

I was thought to believe that art is subjective, and yet I hear complaints and criticism from animators and actors and artists on stable diffusion models generating images and videos of animation that are better than human made ones.

The human made animation industry is a long history of labor abuse and strikes and poor treatment of animators by their bosses. What stable diffusion models do is completely streamline through the human process it takes to generate an animated or not movie, by using matrices and vector mathematical equations, to learn about given data and how it should be applied or implemented based what the prompter gives it.

People always say that ai could replace humans and lead to job losses, of you ask me personally I think AI should take over the stressful and Laborous jobs that people naturally wouldn't want to do anyways like construction or landscaping or customer service representative, especially as the technology improves over the years and gets to the point where it performs better than humans.
If art is subjective, why do so many say AI art isn’t ‘real’ art?
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