Nothing is cruel about discussing the validity of XXY or XY individuals competing with women. Some may throw out demeaning comments but the point here is to discuss. And Caster is XXY. Androgenism is not a universal, it can affect people differently, including how their body responds to testosterone and that isn't all they necessarily have. Caster has the phenotypical male structure, is XXY, has internal testicles, no womb or ovaries, does not have female hormonal cycles, high levels of testosterone, and before she burst on the scene had little training. There is talent there but it is talent in line with state championship level HS males. The reason its a big deal has nothing to do with her rights and everything to do with why we categorize sports separately for women and men. Its not for the men, its for the women.
Do you have a source for this? People with Klinefelter syndrome (XXY) are usually unambiguously male.