If he is half white then he is not black, he is mulatto. I will tell anyone that, just like Halle Berry or any other mulatto. Because he has big lips and a big nose doesn't make him black. He's a mutt.
Techinically, youre right, but nobody uses mulatto anymore. You know how many famous black people are mulatto? Frederick Douglass, WEB Dubois, they were all mulattoes. Most of "black" people who were able to go to college in the early 20th century were mulattoes. That is one of the reasons why Howard University had the "paper bag rule", If you were darker than the paperbag you couldn't get in.
But generally Am. society(Anglo) treats mulattoes as black people, but if they can "pass", then it is a different story. Black families are more accepting of mulattoes than they white half of the family, after all black people in americna are mixed and come in varies different shades unlike white people. Latin culture is different and goes by the skin tone