In the Cigar Store Indian he flies off the handle because Jerry asks him where the nearest Chinese Restaurant is.

MAILMAN: Why must I know? Because I'm Chinese? You think I know where all the
Chinese restaurants are? Oh, ask honorable
Chinaman for location of restaurant.

JERRY: I asked because you were the mailman, you would know the neighbourhood.

MAILMAN: Oh, hello American Joe. Which way to hamburger, hotdog stand?