Segregation still has a vast number of proponents today and it's actively practiced. Every time you hear someone proclaim that some thing or action is cultural appropriation, they're arguing in favor of cultural segregation, which makes general segregation worse. If you can't share / touch / learn from / blend / use other culture, you end up segregated. It's nothing more than a modern form of forcing cultures to not blend or touch, as racists 60 years ago would have demanded just the same. At some point the anti-appropriation people need to be aggressively called out for being segregationists and marked morally for it as we do other similarly backwards racial segregationists.