but this reasoning say that white girls can't dress like Moana because they don't know or come from polynesian culture
would you then say polynesian girls cannot dress up like Belle, Cinderalla, or the little mermaid since it is not from their culture?
Maybe.
"Haven't you given whiteness enough? Like they don't define your beauty standards, and your feelings of self worth? Like you don't spend evening after evening playing with their dolls and watching their movies, imagining yourself in their shoes, shoes which you would never be able to really wear even if you did have all their money and a man. After all that, we're going to give them your adoration, too? Child, what do I need to do to help you learn to love yourself?"
Ah so you're trying to keep the races divided. Got it. ---