Please forgive me in advance for offending anyone.
To me, it's more inappropriate to pretend someone's skin color doesn't exist, because that makes it seem as if it's something to be ashamed of when it isn't. My late husband was Filipino and he wouldn't have been bothered by a child saying his skin was "brown" -- it was brown, or at least tan.
I do think it can be offensive to point out race when it has nothing to do with the topic at hand, e.g., saying "There's a black woman at work who ..." when you wouldn't mention the woman's race if she were white. But it sounds like all your daughter is doing is describing someone's appearance, and skin color is part of that, the same way hair color is.
I agree with the other poster.
My daughter has a whole host of friends who are of all races...and she uses that phrase all of the time.
My Kids and Me in Northern Ireland 2008 - The Giants Causeway ** Sue
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