While I think older, classist values on skin color influence the acceptance of anti-black racism, the shape and form that racism takes is extremely influenced by Western imperialist rhetoric and more recently by US anti-black racism. Because when people talk about other people being dark, they say things like, "She's dark like a black person" or they comment on Harlem or how they saw so many black people walking around in Oakland that it made them scared.

I don't know as much re: China, but I'm guessing that the way Africa-China trade is structured (natural resources out of Africa to China, finished goods from China to Africa), the rhetoric may not be the same as it is with China and other, more "desirable" trade partners (read: the West).

I also think the idolizing isn't idolizing at all, but is just more cultural appropriation, largely because it goes hand in hand with racism against black people while trying to take everything but the burden. The "idolizing" is also taking forms that echo ones in the US: "black people are good at physical things, but not anything mental!" "Black people are good at basketball (implied: but not at anything else)!"