Dude, there's nothing wrong with liking bbc/cuckolding fantasies. The actual history this is "rooted in" is that for centuries black men and white women have been forbidden from having intimate relationships, at risk of punishment, imprisonment, or even death. Now that society has opened up, some women choose to reject white guys in favor of men of color, and some white guys choose to support it. It is exactly what you would expect after centuries of an unjustly imposed taboo. You can demonize it as a "racist fetish" if you want, but to say that now, after the pendulum has swung the other way, that race cannot be a consideration in sexual fantasy is just b.s.
and don't act like you are trying to protect black men from being "fetishized." You are quite open about your feelings for all men. I don't even know what your problem is. I think you just don't like to see black men portrayed as "kings" in porn, and calling it racist is just a way for you to attack something you don't like.