Why Cultural Appropriation Is Bullsh*t

Okay, so to be clear this is my opinion. This isn't "why it is factually for certain" although I do find it rather simple. In my very strong personal opinion, cultural appropriation is a meaningless concept. Let me provide you with the perfect example.
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In this video this woman, who believes it is appropriate to only respect black viewers despite marketing civil rights, (Segregation anyone?) explains how she believes black ghetto culture belongs to it's inventors. (She also misrepresents the argument against her) (Also, dividing people's culture by race?) Which is an okay point, despite my moral misgivings. Until you realize her username (incorrectly) uses a Greek academic term and a French word (correctly). And that English is littered with other languages, and we use their cultures. Do the ancient Greeks own democracy? Do the Romans own plumbing? Do the French own baguettes? Do the Chinese own tea? Does India own Buddhism? Heck, does the Middle East own the Abrahamic religions, seeing as they started there? (Including Christianity) If cultural appropriation is a thing why do we spend so much goddamn time not respecting this supposed principle of cultural ownership? Now, I'm not saying white people should scream "nigga!" at black people or whatever. That would be very rude. And some uses can come off as condescending (The Washington Redskins). But I am saying the promotion of cultural ownership flies in the face of how often we have elements of other cultures in our lives. It is hypocrisy for each and every one of us, because we're all involved in borrowing. So maybe when someone wants to join in on your culture, you might want to consider not excluding them because of race (Are we "separate but equal"?) Why do you need ownership of this thing? Just consider it. I'd argue that people wanting to join in on your culture to be often a positive thing, because that shows people think of it in a positive way. It's now "cool".
Thank you for your time! Have a beautiful day!