Cultural Appropriation

Dr. Jessica Metcalfe (who is a Turtle Mountain Chippewa from North Dakota):
states that when we don Pocahontas costumes or " dress up...  for Halloween or for a music video, then you stop thinking of us as people, and this is incredibly dangerous because everyday we fight for the basic human right to live our own lives without outsiders determining our fate or defining our identities."

I have real trouble with this extension of an old tradition -- costumes, and claiming we do not recognize the originators of a specific item as a whole group. [That is my italics in her quote, by the way.]

The idea that we take these because of an imbalance in the power structure in the underlying societal fabric is  flawed, in my opinion.

If there was no mixing of cultures and ideas the whole literary tradition will collapse. Was Shakespeare wrong to write about the Italian family traditions of the Montagues and Capulets in Romeo and Juliet, which is based on an old Italian folk tale.
A piece of drama since been adapted for Latinos in New York, (West Side Story,) or Baz Luhrmann's 1996 MTV-inspired Romeo + Juliet about gangs in L.A.

I completely agree that there has been  misuse of cultural imagery by colonial powers, but I think too many people throw around this sociological theory as if it is profoundly correct when a little more insight is required to understand what is really going on and the amount of deliberately negative stereotyping that is implied.