The point of appropriation is adopting something and using it for something other than in the way its unintended to the culture or offensive to the culture.

Wearing a Sari at your Indian friends traditional Indian wedding https://abs.twimg.com/emoji/v2/... draggable="false" alt="✅" title="Fettes weißes Häkchen" aria-label="Emoji: Fettes weißes Häkchen">

Wearing a sari as a halloween costume https://abs.twimg.com/emoji/v2/... draggable="false" alt="❌" title="Kreuzzeichen" aria-label="Emoji: Kreuzzeichen">

Wearing a Jamaican flag and bantu knots to celebrate Jamaican carnival https://abs.twimg.com/emoji/v2/... draggable="false" alt="✅" title="Fettes weißes Häkchen" aria-label="Emoji: Fettes weißes Häkchen">

Wearing Jamaican flag and bantu knots to a costume party https://abs.twimg.com/emoji/v2/... draggable="false" alt="❌" title="Kreuzzeichen" aria-label="Emoji: Kreuzzeichen">

Your white friends wearing asoebi to your trad https://abs.twimg.com/emoji/v2/... draggable="false" alt="✅" title="Fettes weißes Häkchen" aria-label="Emoji: Fettes weißes Häkchen">

Your white friends having an “African theme” party where they show up in African traditional outfits https://abs.twimg.com/emoji/v2/... draggable="false" alt="❌" title="Kreuzzeichen" aria-label="Emoji: Kreuzzeichen">

Getting henna on hands at a culturally appropriate celebration like a Mehndi https://abs.twimg.com/emoji/v2/... draggable="false" alt="✅" title="Fettes weißes Häkchen" aria-label="Emoji: Fettes weißes Häkchen">

Getting henna cos its edgy and cute https://abs.twimg.com/emoji/v2/... draggable="false" alt="❌" title="Kreuzzeichen" aria-label="Emoji: Kreuzzeichen">

Cultural appropriation does not mean “people not of a culture participating in that culture”

It means “people not of a culture taking aspects of a culture and using it not as is used within its cultural context and/or offending people of that culture”.