There's a long history of white people appropriating cultural symbols from black people in particular and then excluding black people from that very thing. People in here are talking about the double standards black people have faced against dreadlocks that white people don't. Rock music can be traced to black musicians, but there's decades worth of exclusionary and racist trends in the genre.
I'm not saying your sentiment is wrong, because I agree with it. But there's a wider context to it and we white people (don't know if you are white, I just mean "my" race) seem to be immune to the kinds of cultural erasure that minorities face. It's "fine" for white people to adopt other traditions because it shows how "inclusive" we are, whereas it's "exclusionary" of minorities to maintain their own culture and not conform to white norms. It's a huge social double standard and makes it a little harder to just say "well we're all free to do anything if it's with the right intentions" - I mean, that's the justification I've heard from some disgusting people I know that think it's okay for them to use the N-word.
