Okay, one, I am a different person. Two, it's not a logical fallacy. Logical fallacies have names. I thought about asking if you knew what code switching was, and I really should have. You don't seem to understand why I brought that up. There are lots of black people in the US who will talk to white people in a different way than they will talk to their friends and family. It's usually more polite, more cordial, more deferential, and much, much less "crass". Now, think about this for a second: why would a black person in the US want to be seen as *polite* in front of white people? What assumptions do you think they're making?