Obviously people of different cultures are slightly genetically different, otherwise how could you be racist against strangers! In the case of the professor who learned she was not ethnically indigenous, people didn’t want her out just because she, individually, was pretending to be native. It’s because there is an entire industry and extensive history of non-native people smothering native culture, telling native people through movies, books, etc. of what their own culture is or what it means, and of native arts and symbols being used by white people to make a quick buck. She /symbolized/ a sore point for the community and furthermore she was not open about it. The whole situation was unfortunate, but the author seems more interested in her case to prove his own point than in the concerns of the community he is poorly explaining about.