No, I don't have such a source. But I'm puzzled that you are so resistant to even the possibility that the disease might affect different groups differently. Granted, nothing I've mentioned comes close to constituting proof. But I do think it all constitutes mounting evidence.
Remember all the talk when AIDS was getting started about how it was going to affect everybody equally?
I'm hesitant to draw conclusions, even temporary ones, without adequate evidence, and I do not see adequate evidence here. That does not mean that I deny the possibility of some ethnic groups being particularly susceptible.
As for AIDS, I remember the early days of it spreading, when it was thought that Haitians were particularly susceptible. It turned out that the large number of Haitian cases were the result of American homosexual tourists using young Haitians as butt boys.
Until we have adequate data to analyze, guesses are just guesses, not informed ones.