I’m still trying to figure out how saying that someone is not a natural born U.S. citizen is “rasis”. That’s quite a stretch.
That one is easy. Any criticism of, or inquiry about a black person is racist. It doesn't matter whether or not the inquiry is routine, normal, justified, or anything.
A commentator on CNN brought up that there have been 5 or so substantial birther controversies in the history of the US. Lemon interrupted the history lesson, and injected that the facts are irrelevant. Lemon and many black people (Van Jones included) are offended that anybody would ask a black presidential candidate to prove his qualifications. Making the same inquiry of a person of any other race is not racist.
It is a simple formula, it is totally irrational, and it is totally real. It is a waste of time to attempt to reason with this type of person. They are not capable of reason. They are offended for no good reason. Write them off.