I know it's shit, but it's the only one that springs to mind.
A black man is working in a bar, a Chinese man walks in and sees he is working. He walks up to tbe bar, "Give me a trigger, ******!" he says. "Excuse me, please don't call me that!" says the barman, "OK, ok, ok!" says the Chinese man. "It won't happen again!" so the Chinese man drinks his drink, and says it again, "Give me another trigger, ******!" "For fucks sake! I told you not to call me that, Don't do it again!" "Jeez! Calm down!" says the Chinese man. After his drink, he turns to the barman, "Give me a trigger, ******!" "Fucks sake! That's it! How about we change places a moment, so you can see how YOU like it!?" "Yeah yeah, sure!" says the chinese man. So the Chinese man swaps and goes behind the bar, the black man walks up to him, "Give me a drink, *****!"
The Chinese man says: "Sorry, I don't serve ******s!" and pours himself another drink.