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IF it looks, sounds, and acts like a DUCK, how come you can't call it one????
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You certainly can, but you wouldn't normally do it if they were from an ethnic group that you were familiar with. It just comes off as a slur sometimes when a perceived foreigner is described as being from their country of origin, for example 'This Mexican' as opposed to 'This dude.' I'm not being sensitive, I'm being observant.
(PS - Kudos again to D and A for his good deed. This thread is snowballing!)