To the OP, it's an interesting issue. Personally I think the answer is the same, or related to, the question of identity. For instance in America you can't be white unless both your parents are white. You have to be "pure" white to be white.
It is ridiculous in a kind of logical sense. Why is it that a person with a "white" parent and a "black" parent really can't call him/herself "white", they must call themselves black. What is the quality of "white" that as soon as it is mixed it is no longer that thing, but when "black" is mixed with anything then that thing is always "black".
I don't know, that just my experience here in the last 40 years in America. If I said anything that offended someone I apologize but I would actually appreciate a detailed reason why you were offended. It's an interesting subject to me. I started using the "other" check box on questionnaires that asked for race or ethnic group when I was about 10. That's when I figured out how this "race" thing is designed.








