Well, if ever I struck anything like it, I’m a n*****. It was enough to make a body ashamed of the human race.
– Mark Twain
The Adventures of Huckleberry Finn, Chapter 24. Finding his moral voice, Huck is disgusted at the King and Duke conning the entire town and pretending to be brothers of the dead Peter Wilks. Note he uses the racist slur “n*****” in a negative way, to mean fool.