tell us more, dissenting opinion
About how cultural appropriation is real? I am no expert on this topic, but I know enough to hold justified belief.
Call it whatever you like, "cultural appropriation" is an unequal exchange of culture between two groups of unequal power.
If black musicians get ignored on the basis of their race, which they do, and Elvis Presley gets famous based on the false belief he invented their music, that's an unequal exchange.
People might say that ideas comprise culture and ideas can't be stolen. That's not entirely true. In computing, when a piece of information is "moved," it's actually being deleted in one place and copied in another place. If the privileged group destroys the oppressed group's culture then recreates a mockery of it for their own purposes, how else can we describe that than as a coercive motion of ideas, a theft?
Don't take my word for it. Go read. Education can really change your life; it did for me.