Now, I grant you, the Left has sought to demonize any recognition of human differences--that is, with some exceptions. They cannot very well get away with trying to demonize medical practitioners for recognizing that heredity influences susceptibility & resistance levels to various maladies, for obvious reasons.
I can only reiterate what I've previously stated.
While technically correct, the term 'negro', has long been considered by the vast majority of blacks in this country to be a racial slur. The term fell out of favor in the mid sixties, and has remained so amongst blacks ever since.
That is the cultural reality. You can reject that reality if you like, but understand that 42,000,000 people in this country consider it to be an insult.