You’re right, Negro should have been added to that list. So is the NAACP going to have to change their name because it’s a racial slur? How about the Negro College Fund? Double standards abound.
Funny thing about the word Negro being unacceptable. Good luck banning it from the Spanish and Portuguese languages. Definition: "Negro denotes "black" in Spanish and Portuguese, derived from the Latin word niger, meaning black, which itself is probably from a Proto-Indo-European root *nekw-, "to be dark", akin to *nokw-, night."
They all mean black, or dark skin. Same difference. It's not a real slur, just a perceived one. Meanwhile they call caucasian people "cracker", "honky", or shudder... "white" - and caucasian people don't go ballistic. Blacks should concentrate on more important things, like lightening up and bettering themselves.