Context. I use the word "retard" often to describe when something is moving slower than normal or even reversing trend. That is the appropriate word to use for that situation, so I don't worry about being politically correct to make a point. The ENTIRE WORLD uses nigger for those of black skin color except America, whose political correctness calls for African American, which doesn't work for a European black man as I found out the hard way... Like I said, context. EDIT: I'm very intoxicated right now so, what I say I hope is sound as good as it does while writing it.
"The true value of a human being is determined primarily by the measure and the sense in which he has attained liberation from the self." -Albert Einsetin