A guy goes into a store and tells the clerk, "I'd like some Polish sausage."
The clerk looks at him and says, "Are you Polish?"
The guy, clearly offended, says, "Well, yes, I am. But let me ask you something. If I had asked for Italian sausage, would you ask me if I was Italian? Or if I had asked for bratwurst, would you ask me if I was German? Or if I asked for a kosher hot dog, would you ask me if I was Jewish? Or if I had asked for a taco, would you ask if I was Mexican? Would ya, huh? Would ya?"
The clerk says, "Well, no."
"And if I asked for some Irish whiskey, would you ask if I was Irish?"
"Well, I probably wouldn't."
With deep self-righteous indignation, the guy says, "Well, all right then, why did you ask me if I'm Polish just because I ask for Polish sausage?"