I can tell the difference among varying groups of people within a region but I grew up in a area that was very diverse and taken a lot of course work in physical anthropology. The thing is that many people are multi or biracial and even within a regional group there are variations. Furthering that, a trait from the past can pop up due to independent assortment and make someone appear to be from a different group. I've heard/seen this most from Native Americans/Alaska Native/First Nations people of the arctic who are often mistaken for being Asian.
I've been one of two white women in a work place of a few hundred and we were never mistaken for each other. When a customer said they were helped by a white lady they knew to call me or the other woman, but we were different heights and age, as well as working different departments. I've usually taken someone calling me by the wrong name in stride as if a parent called a kid by their sibling's or pet's name, brain misfiring. If someone is a complete jackass and always spells my name wrong, forgetting a vowel or adding consonants, then I get irritated.
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