This is one column I never thought I’d have to write, but apparently someone has to give lessons about when using the “n” word is racist, and when it isn’t. Enter Phil Mushnick, New York Post columnist and latest target du jour of America’s “Bust Whitey’s Hump” brigade. And believe me, when this crowd saddles up, ANY white guy will do as a target, no matter what he said, or the context in which he said it.