You know why.
Whites tolerate blacks with a white woman, which represents a step up for the black guy. Blacks resent white men with black women and see husband-as-head-of-household white men as placing a black in a subservient position.
Agreed.
Bingo.
A white man with a black woman is “stealing” a woman from the black community, and making black men look like they “aren’t good enough”. Black men do not like this at all.
However, if a black man couples with a white woman, and some white man says, “That’s not OK”, then the white man is a racist.
It’s a long-standing double standard.