A man of Polish ancestry walked up to the counter and asked for a Polish Meatball Sandwich. The man at the counter said, “What a Pollack.”
The Polish man said, “I resent that. If a Jew came to your counter and asked for a kosher salami on rye, would you call him a stupid Jew.”

“Probably, ” replied the clerk.

“And if an Italian came in here and asked for spaghetti and meatballs, would you also insult him?”

“Probably,” the clerk again replied.

“Why you're nothing but a bigot. Why do you have to insult everybody not like you?”

At this, the clerk replied, “Because this is a HARDWARE store, moron.”