This actually is an exaggerated myth perpetuated by both bitter LSA divestors and bitter PAWGers/Red Pill types.
Over 80% of Black men making over 6 figures are married to Black women. Judge Mathis has a Black wife. Denzel has a Black wife. Lebron has a Black wife. Obama has a Black wife. Ben Carson(I know he's

but still) has a Black wife. A lot of wealthy Black men in NYC, DMV, Atlanta, Houston, North Carolina, etc. have Black wives.
Yes...there are Black men that date and marry out with White and Hispanic women for sure and this is especially visible with brothers in Hollywood who get a lot of press but it's exaggerated for the most part.
I live in NYC.....one of the most diverse and liberal cities in the world and where there's a strong Black middle class in certain nabes yet I honestly RARELY see Black men with White women unless I hang out in some really gentrified areas in Manhattan/Brooklyn. There are many Black men with Latinas but most of the brothers I see with Puerto Rican, Dominican, or other Hispanic women tend to be working class or Blue collar.
Maybe in the West Coast where there's a lack of Black communities outside certain hoods this is an ongoing thing but in the East Coast and the South, it really isn't. When I visit my fam in South Carolina, the vast majority of middle class Black men I've run into deal with sisters even though you will see an epidemic of chunky White women with biracial kids who don't look prestigious or rich in the slightest.