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It's a cascading failure of masculinity due to multiple factors.
Broken homes means several generations of boys losing strong male role models, that gets passed on and further diluted each cycle.
Our modern lives do not feature or require much physical exertion, which is the major featuring trait of masculinity.
Phytoestrogens and other hormonal disrupts is a contentious topic but perhaps contributing also. Certainly hormones polluting water and food are having a non-zero effect.
Overall you can trace most causes back to empowerment of women. That's not a judgemental statement about female empowerment, but I do think the soiboy phenomenon, transtrenders, and a host of other modern weirdness can be linked to it with a strong case.