Cultural appropriation is bullsh#t and anyone legitimately engaging that kind of pseudo-Maoist nonsense is terrible and should be ashamed of themselves.
I... agree?
"Cultural appropriation" is how cultures form to begin with.
No one with a brain would dispute this. Nevertheless, it's worth considering that cultural appropriation doesn't necessarily have ameliorative effects on discrimination faced by racialized and/or exoticized others. African-Americans laid the foundation for the vast majority of contemporary music but they haven't received much credit for this. Picasso was influenced by African tribal art but most people are not aware of this. Gitanos in Spain are arguably responsible for Andalusian music but they still face discrimination.
Cultural appropriation leads to great, awesome, powerful art but it certainly could take place in a different manner.