You said:
"Confront people with a demand that they place what is Black and undiluted above all else and watch their reaction."

Their reaction is predictable. Distortions to outright lies are peddled in their attempt to maintain the anti-dark-skinned Black African status quo. The idea of dark-skinned Blacks being the ideal example for upliftment threatens their concept of a place in the Universe. Of course, their feelings of being threatened stem from insecurity. They are unaware that their feelings of worth are annexed to the degradation of the dark-skinned Blacks. It appears that 'many' Blacks have internalized racism to the extent that they too are threatened by the advancement of dark-skinned Blacks.