"Clerk Has Him Figured Out" joke

A guy goes into the store and says to the clerk, "I would like some Polish sausage."

The clerk looks at him and says, "Are you Polish?"

The guy says, "Well, yes I am. If I had asked for Italian sausage would you ask me if I was Italian? Or if I had asked for German sausage, would you ask me if I was German?" Or if I had asked for a taco would you ask if I was Mexican?"

The clerk says, "Well, no."

The guys says, "Then why do you ask me if I'm Polish just because I ask for Polish sausage?"

The clerk says, "Because this is a hardware store."