I've embraced the one-drop rule.
For a few generations, now, the American Africans have insisted that if you have ONE DROP of black blood, they own you!
Works for me, if all the mixed successful mulattos, quadroons and octaroons are willing to go along with it.
Which I very seriously doubt!
Only the dull-witted would buy that crap.
Self identification matters... but he's still half white and half black...