Imagine someone would sneak into your home and steal your shoes, socks and underwear just to get off on that or give it to someone who does.
Wouldn't that feel wrong? Wouldn't you feel violated? It's the same with such AI porn tools. You serve to satisfy the sexual desires of someone else and you are given no choice. Whether you want it or not, you are becoming part of their act. Becoming an unwilling participant in such a way can feel similarly violating.
They are painting and using a picture of you, which is not as you would like to represent yourself. You don't have control over this and thus, feel violated.
This reminds me of that fetish, where one person is basically acting like a submissive pet and gets treated like one by their "master". They get aroused by doing that in public, one walking with the other on a leash like a dog on hands and knees.
People around them become passive participants of that spectactle. And those often feel violated. Becoming unwillingly, unasked a participant, either active or passive, in the sexual act of someone else and having no or not much control over it, feels wrong and violating for a lot of people.
In principle that even shares some similarities to rape.
There are countries where you can't just take pictures of someone without asking them beforehand. Also there are certain rules on how such a picture can be used. Those countries acknowledge and protect the individual's right to their image.