When black and white men are being sold to black and white men.
fixed for accuracy.
Doesn’t really matter if the people being “sold” include people of other races. The imagery of a black person being auctioned off in and of itself is the problem. If the ad had been entirely white players, it wouldn’t have been an issue.
None of your other examples involve a human of a minority race with a history of being sold as slaves. Auctions themselves aren’t the issue.