This tripped my trigger. I'm kind of amazed that so many words have been "classified" as insulting, slurs.
(North America) a white woman to a black person—or a black woman who acts too much like a white one. While Miss Ann, also just plain Ann, is a derisive reference to the white woman, by extension it is applied to any black woman who puts on airs and tries to act like Miss Ann."
So, a White woman calling, or referring to a Black woman as, "Ann" or "an Ann" is an ethnic slur. What if her name is Ann?https://en.wikipedia.org/wiki/Nignog