The female body is better suited for survival in harsh conditions

Yea whatever, men are stronger and faster. But in an actual post-apovalyptic scenario where food is scarce and diseases and infections could be rampant, the female body is better suited for survival.

First off women have less muscle compared to body fat naturally. So the female body needs less calories to survive.

Women have more active immune systems. This is superior when it comes to surviving potential infections. In this modern world, women have more autoimmune disorders for this very reason.

In an enviroment with no amenities and comforts of modern civilization, you are more likely to die from an infection or starvation than in combat. So in reality men are the ones who would be worse off without the comforts of modernity.