First of all, telling a Native American to learn his own history is mind bendingly racist. You should be ashamed of yourself. Second of all, did you even read this article that you're citing?
"With the conflicts between white Americans and American Indians dropping off - as a result of their near extermination - after the early 20th century, the usage of redskin to describe anyone other than Washington, DCs football team, declined steeply in the 1950s. And, in a certain irony, an accurate descriptivist account would again register that shift. The word redskin went from a self-description of American Indian people (contrasted with the new immigrants), to a pejorative description of the American Indian people (by the new immigrants), to a description of a football team and its players. Any prescriptivist account, that the word only means one of those things, misses the mark and the complexity of its history. One particularly sticky element of the word redskin, however, is the direct link between its connotations and the complexion of its utterer. It would be tone deaf, and oblivious to history, for white Americans, and white Redskins fans to fail to recognize that, for many American Indians, white people calling them redskins is synonymous with this countrys attempt to exterminate them. That is certainly not the way I believe most Washington Redskins fans use the word, but it is important recognize why some see it as malignant. However weve also seen that the meanings of words can (and do) change."
That's a quote from the article disproving the very point you're so condescendingly trying to make. You've outed and embarrassed yourself in this topic.
lol uh no telling someone not to be ignorant of their own past is not racist. that was a reach