So you feel that wearing or using something that resembles a traditional item of a culture when you are not a member of that culture is impersonating an entire 'race' and a racist act mocking that culture. Why do you believe imitation is always mockery? If I see a child dressed up in a "Indian" costume, it does not make me think badly of your race. Why does the lack of authenticity automatically constitute racism? Cultural appropriation happens universally. So we are all racists? Including you.

Asker's Portrait Asked by tunes-tits-and-tetrameters

Answer

I do not cultural appropriate anyone, nor do a lot of people. Ad populum arguments are invalid. Just because “everyone” is doing it doesn’t make it okay. 

When non-natives wear “Native American” costumes it dehumanizes us real natives. If we are just a costume or a character then we aren’t seen as real people. When people are viewed as subhuman violence, such as genocide which has happened to us before, is inevitably going to happen to us. When the white settlers came here they thought of us as subhuman and that made it “okay” for them to kill us, in their eyes.