All cultures appropriate from all other cultures. In fact, that’s how cultures change and evolve over time.
The answer to the question is quite simple: there’s nothing that a writer isn’t allowed to write.
Titanium Dragon
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That statement is an exaggeration.

There is literally a group of people with such intense xenophobia that no outsider that has visited them has lived. We have reports of recognizing these people as they walk their shores, and hypothetically, we could fly a surveillance drone, but budgets.

At the same time, cultures change due to members of that culture acting differently from their history or tradition. Cultural change does not require appropriation at all.

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