People get into this scene for many varied reasons, and I suppose there are a lot of white cuck wannabees with the inferiority complex fetish who are the real drivers of the 'superior BBC' idea, more than the women!
Now I have an average 6" and am not really bothered about what others have as I have found it was never an issue with the women I have had in my life. My slutty wife has no issues either with it, she just likes BBC as well.
Just trawling the web, you see many pix of huge white cocks, and a lot of small dick white guys who seem to relish humiliation. You don't get to see this much with black guys, you just see the big cock ones in the main. What with the reputation of the BBC, I feel really sorry for a black guy who has only an average sized cock, it must be hugely embaressing, and I cannot believe they don't exist! If I was black with a small cock, I would never show it.