Thank you for laying that out. I took your comment to mean that it was the second-level poster, and not RFK Jr., making those claims, but this clarifies things.
As for any ethnic preference of SARS-CoV-2, I've not seen any evidence for that either. We do know that it affects men worse than women, which is explained by XY instead of XX chromosomes (women are better at fighting it off as their immune systems begin the work sooner). The comorbidities in the US just happen to be because we have higher tendencies toward type II diabetes (poor diet, lack of exercise). That's not anything special about the virus, though.
Here is the paper where he got the claim about the ethnic preference of SARS-CoV-2. It was produced by the Cleveland Clinic and mentions differences in the cleavage sites depending on race.
As for any ethnic preference of SARS-CoV-2, I've not seen any evidence for that either. We do know that it affects men worse than women, which is explained by XY instead of XX chromosomes (women are better at fighting it off as their immune systems begin the work sooner). The comorbidities in the US just happen to be because we have higher tendencies toward type II diabetes (poor diet, lack of exercise). That's not anything special about the virus, though.