If someone is mocking a culture, using it as a costume or using it without understanding the meaning, I get how that is offensive.
When someone does their hair a certain way because they think it’s beautiful, that’s cultural appreciation.
When someone eats food from another culture, that’s cultural appreciation.
When someone wears clothes from another culture in the right context, that’s cultural appreciation.
The intent and the context are important, this isn’t a clear cut right or wrong. Though some people police it to a ridiculous extent, wanting to keep white people in a box to be preserved as far away from any other culture. God forbid people share good things with people different from them.