I also think there are different expectations when you marry interracially. With your own race you know what you’re getting.Most of the time bm and bw are on their best behavior when they date/marry out.
A lot of us save the scraps within ourselves for our own people. Also, many men have allowed their hearts to be ruined by women who they should've never given it to the first place. A failure to properly vet and heed red flags, turns into a blame game towards bw as a whole.
When a man marries a woman who shares the same skin color as the woman who disappointed him, it can cause more vitriol, from what I have seen. It seems to be a common misconception among many black people, that life is happier and smoother with a white person. Fairy tales.