^ BTW, that is my experience too. ITAA bit off topic, but I believe kwanatic is absolutely right. Historically in the U.S., individuals who look black have been identified as black. And this has even been the case legally. Many Southern states in the 1900-1960 era actually legally defined individuals with any African ancestry, even 1%, as black. You can see that this idea is still current in how people refer to Barack Obama. How often do you hear anyone refer to him as the "44th white president of the U.S."? But all the time in the media and elsewhere, he is known as the "1st black president of the U.S." Either description is just as true as the other, but because of his skin color, people see him as the latter.
Anyhow, I don't want to offend anyone, but I did just have to agree with what kwanatic said.