Respectfully, I disagree with your definition of cultural appropriation, but i agree it's wrong to deny others the right to identify with their heritage or cultures.

Cultures borrow from one another, it's just the nature of having multiple societies in proximity. I would argue (outside of the realm of exploitation) more often than not, cultural appropriation doesn't come from a malevolent place, nor does it restrict anyone from otherwise enjoying their own heritage and culture. Some 9 year old wearing a Halloween costume of a Disney princess that isn't their own race isn't the crime we make it out to be. Worst case scenario it's a faux pas, best case scenario, that kid took an interest in a group of people they are not familiar with and learned about them.

Also, as another commenter pointed out, the term cultural appropriation is used to cover a wide variety of offenses, so this disagreement could potentially come from that.

Edit: clarity