Research recently showed that there is more genetic diversity between average members of the same "race" than there is between average members of two different "races". Hence, the distinction humans make based on the colour of a skin is purely arteficial.
The way I see it: "race" is indeed a social construct because of the way humans see and interact: it's just easier to describe someone as having a different skin tone than saying he has slightly longer toes. This doesn't mean that there's no such difference in skin colour, just that it's not too important genetically.
Personally I divide humanity in two groups: people I like, and people I dislike. I don't care about your particular genes.
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