Iranian & American

An Iranian walks into a bar in America late one night.
An American guy takes the stool beside him at the bar.
'Are you one of those 'ians'?' asks the American, with a contemptuous smile.
The astonished Iranian asks, 'What do you mean?'
'No difference, Arabian, Iranian, Indian, all the same,' says the American in a humiliating tone, laughing out loud.
The Iranian asks instead, 'And are you one of those 'keys'?'.
'What would that mean?' is the American's question.
'No difference, donkey, Yankee, monkey, all the same!