Find the offensive words in this exchange:
Patient: Doctor, I am having trouble with my legs.
Doctor: Hmmmm...based on the developmental stage of each knee, I'd say you need some supplements to help your knee grow.
Patient: You racist bastard! I'm not here to listen to you degrade black people!!!
Doctor: What the hell are you talking about? One knee is underdeveloped. This will cause you even greater pain and expense over time if it's not addressed. We've got to help that knee grow!
Patient: What makes you think the negro wants your help?
Doctor: Not the negro you idiot! I want to enable growth in your knee?
Patient: Why didn't you just say so instead of insult black people?
Doctor: Who's on first?
Patient: Who gives a shit?