It's largely driven by social dynamics. If your group generally expresses disgust for AI art, you subconsciously know you have to have the same opinion about it.
Your post is a bad example where you make an artificial distinction based on how you generate it in order to make it okay.
It's okay for what you are doing because it's incredibly convenient. It's not okay for other people because you know it's unpopular.
For videos also, you need to distinguish between that and images or other types of art. Videos are more challenging than still images and just starting to get to the point where the latest ones don't have a lot of weird obvious spatial temporal artifacts.