To be frank, I don't think you've actually conducted an empirical comparison of "black male + white female couplings IRL and in the media", nor do I think such a discrepancy would be worthy of comment even if it exists, and perhaps most importantly, I do not believe in the innocent motives of anyone who brings up the subject and then acts like they are only attempting to make an innocuous anthropological observation.

I'm not interested in a 'debate' about race-mixing with you. I just want to point out that when you tell on yourself like this, both online and IRL, people notice, and we'll treat you accordingly.