I am mixed. Just annoys me when some one says I am black. Because ti discounts half of my heritage and half of me. If the skin is caramel-esque in colour or the face structure is more akin to a white person than a black person then odds are they are mixed race. But in the USA, for some reason, if you have any black ancestors that automatically makes you black, too? Its weird.
Ok, I get it now, it's something personal and also has a lot to do with the country where you are linving in. But it's a matter of perspective at the end. I'm mixed myself, my father is a blue eyes, blonde and caucasian man and my mother has dark hair and eyes and 'latino' color skin. I'm a man with honey/green eyes, dark hair and blonde beard, with 'latino' skin as a result, very atypical and exotic LOL. I don't expect that somebody guesses that my father is a blonde caucasian and I don't have a problem with that. Depending of the region and the amount of tan, I am considered a white person or a 'trigueño' one (I don't know the english term for that, if there's any, they use 'latino' I think), some people even say that I am actually yellow LOL. The people don't have to know my heritage.
In Latin America, according to my experience, we call a woman like Halle Berry a black woman too, independently of her white mother. So, I would not say that is different than USA in that categorization.