It's not exactly ridiculous - it's an emotional response. To be fair, viewing women as pieces of meat / breeders / subhuman is a pretty widespread part of society and is a kind of misogyny.

Giving birth is an ability that most women have (and is potentially the flip-side of disadvantages like the gender pay gap adjusted for job choices and maternity leave), that men categorically do not have (while men wield the strength advantage), and giving that ability to men on a large, cheap scale is a scary thought for women and could have huge implications.