They're so upfront about their exclusive attraction to white women and they'll give you a list of reasons why. They smugly go out of their way to put down black women based on stereotypical notions about their attitude, or hair, or something equally stupid and it's corny and disgusting.
That's one of the issues with interracial dating.
Sometimes white girls hid me from their family, especially their father. I had one girlfriend in high school who strictly forbade doorbell ringing. She was not going to go through the trouble of calling attention to the fact that she was going out with a black guy.
The world made it complicated and assumed I had an ulterior motive, and it sucks, but I understand why.
There are self-hating black men who date white women for contrived and pathetic reasons and I hate them.
The concept of a black man in a relationship with a white woman is a "thing" that people have an opinion on, and that opinion comes with an entire set of stereotypes, fueled by racist ideology, a complicated past, and sometimes even pop culture.
Kanye West once rapped about how successful black men will "leave your ass for a white girl," and then put himself into that box by marrying a white woman, furthering the pervasiveness of flawed, generic ideas about interracial relationships.