I believe CA is not ok if it's used to mock or satirise other cultures. For example turning up to a fancy dress party with Black Face singing Mammy. That's clearly racist and narrow minded. Or when someone knowingly cashes in on a cultural aspect while claiming to be that culture when they are not. For example someone who sells Indigenous dot art as just that, when in fact they are not Indigenous.
My issue is whether any culture really owns a practice, a hair style or an art form? Egyptians apparently had dread locks, does that mean modern day African Americans are stealing dreadlocks? Interestingly, American Indigenous art is quite similar to our Aboriginals. The notion of Day of the Dead has lots of connections with Halloween, a pagan Irish day which has then become the culture of the Western world. So who actually owns the notion of celebrating the dead? Are African American women culturally appropriating western culture by straightening their hair?
Furthermore, in the case the dread locked white teen, are we actually dissuading cultural diversity and acceptance by refusing to allow others to wear/eat/draw in our style? Or do minorities see it as 'diluting' their culture? Like others, I'm not from a minority group so am I entitled to even say?