There was this one black foid who makes videos about black men. She's coming from a rather bitter place because she chose a heavily tattooed Tyrone who left her a single mom. Cynthia G is her name
In some of her videos she pointed out that in most black male white female couples the woman is overweight, which is true. In her words those women are the left overs of white men. She also inserted a clip of a somewhat rotund white girl saying that she got bullied by white guys at school and that's why she started to like black guys. Even though that doesn't directly say why she finds black guys attractive, I guess the reasoning is that if she can't get a white guy then black guy is her next best option.
In some cases there is probably rationalization at play. Basically because some of those women can't get a white guy they want, they start to make up reasons why they prefer black guys because the ego is a fickle thing, its not like these women want to admit they got rejected by white men. Whether their explanation is that black guys have swag, confidence, they're better in bed than white guys, bigger dicks, whatever. The point is that the rejection came first, then came the rationalization, the cope. You can probably sometimes see this in women who are bitter towards white guys, that's why they need to be public about their preference of black men even though nobody asked.
But its not like all of these women are unattractive, some of them just seem a bit slow in their cognition. Some of them are just white ghetto rats so they relate more to black people.