Interestingly, that is exactly what Marlon Brando was talking about in 1972, when he refused the Oscar for Best Actor (The Godfather). He was opposing the portrayal of Native Americans on the screen. To make his point, he sent his refusal via Sacheen Littlefeather. As I recall, she was met with hoots of derision from the Academy attendees.
The following interview with Brando explains more fully what he was hoping to emphasize in his refusal.
Amazing how little the non-cinematic world has learned over the 50 years since this interview.
