If they think you're safe, i.e. "not mean", they will ask you everything they ever wanted to know about Black people. If you tell them you don't know about something they think you should know, they will quickly tell you that you're "not really that Black". My sister takes pride in the fact that White folks don't play with her like that, but they can just tell she's mean (she really is), lol.
So am I, which is probably why I'm rarely approached by inquisitive "others."
