Truth is they call black man "hypermasculine" because in comparison to the white man, we are hypermasculine. But that has to do with the fact that white men happen to be very feminine and instead of calling it that, they use the term "hypermasculine" to label black people when in fact, we are just masculine enough.
Anything to avoid adding a negative stereotype to white men. Instead of figuring out whats wrong with them and why they are so feminine, lets just make it seem like black men are the ones that have the issue.