There are any number of medical problems which tend, at least, to be linked to ethnicity. Those would be rooted primarily in heredity, rather than behaviour. But can anyone imagine that the medical problems of a marginalized, stigmatized group would receive more appropriate medical research and care, compared to a group with "mainstream" acceptance? Why would the dynamic be reversed, because a group is identifiable for different reasons? There is a whole field of athletic medicine, focused on a group who are identificable by their behaviour.