I write in the book that there's a weird combination of entitlement and inadequacy. You're entitled as your birthright as a male to women's bodies, you're entitled to power, you're entitled to glory, you're entitled to this heroic position. But you're also never going to meet it, so you're always going to feel shame and inadequacy. That combination makes is like a perfect storm for this resentment and emasculation.
This is interesting, Ive never thought of it that way. Tell men they have a right to a particular way of life, then make it next to impossible to achieve and finally feed off the resentment that perceived failure breeds.