There was a black guy working behind the bar, and a Chinese guy walked up to him and said, "Give me a jigger, nigger."

The black guy responded, "That is not an appropriate way to talk to someone. How would you like it if someone were to talk to you that way?"

To prove his point, they switched places. The black guy comes out from behind the bar, and the Chinese goes behind the bar.

The black guy goes up to the counter and says, "Give me a drink, chink!", and the chinese guy responds "No. We don't serve niggers."