Contradictheory: When is it cultural appreciation and when is it appropriation?

Cornrows on white people have riled up black Americans, who feel that it's an example of cultural appropriation. — 123rf.com

A few weeks ago, in August 2020, an actress posted on social media a photo shoot of her advertising contact lenses while wearing lehenga (traditional Indian clothing) and sporting henna decoration on her hands. The actress is Malay.

Now, is it a problem that I didn’t think it was a problem until people online pointed out to me that it is – perhaps – a problem?