Meh. Not buying. Besides, that blade has two edges. Black men are as likely to consume that porn due to the vicarious satisfaction of demeaning the white man out of a lingering subconscious fear that they are inferior after centuries of emasculation.
More likely, it's a psychological extension of the same irrational fear that contributes to guys fearing a girl with a porn history above a girl who simply has a normal sexual history-- however deep that history is. It's signals that these guys believe big dicks are correlated to looser women. Ignorant men also believe that black men have larger penises (not true in the USA). This simultaneously reflects the deeper subconscious fear of sexual inadequacy as a male, also irrationally measured by the association of a smaller penis with the inability to please a woman (though this reaches a point where it is valid), and that one will be unable to maintain a woman's sole interest.
These all stem from the primal instinct of jealousy, and while weak, stupid, ignorant men are dumb enough to be brainwashed by feminazis into believing that distrusting this instinct is always wise, in fact, these irrational tendencies are a casualty of an otherwise razor sharp instinctual intuition guided by an evolutionary imperative that is itself conditioned by human behavior existing outside of purely natural habits (though guided by these habits). After all, the fear of a woman straying and sleeping with other men may be irrationally seated in a small penis, but the fear itself is rational. Women cheat. As DNA tests have revealed, they do cuckold their husbands...frequently.
That jealousy we feel as men is a compass-- just like fear. Don't be slave to it, but listen to it. It is the wisdom of the eons reaching out to you through your biology.