That is simply a part of society in today's world. Every White person has to tip-toe around the 'negro' in the room, for fear they might be offended by something/anything.
But, back in the real world of reality, what could possibly be more racist than that. I don't see Liberals tip-toeing around Asians, or Arabs, or Europeans, or anyone else.
It is because Liberals inherently view Black people as inferior, just on the face of it no matter who they are, that they feel the compulsion to talk slowly, and come up with a dozen euphemisms for saying a Black person is Black. Heaven forbid that I would ever curse anyone by saying that they are Black. They are not Black, God forbid! They are 'people of color'! hehehe, yeah... sure they are. LOL I know a Black person when I see one, Dumbass.
It is the straitjacket of political correctness that hurt Romney. It was McCain's affection for Leftist ideology and radical Islam that caused him to side with Obama. McCain was obviously thrilled at the idea of Obama being President. He said so himself, many times.