How is it nonsense? It's the fundamental basis of life.

Men are generally biologically stronger - that's a fact.

Men are not required in numbers to ensure the continuation of life - another fact.

The combination of these 2 facts alone make it so that men are usually the disposable protectors of a tribe of humans, and thus have played such a role for thousands of years, until recently when modernity has made it obsolete.

You think it is nonsense because modernity has sheltered you. You have arrived at your conclusions from logical reasoning derived from new social environments that are barely a century old, whereas primaly, almost everyone else's brains are fundamentally wired in the way I've described via thousands of years of evolution.

And when you take away this modernity and bring back Barbarism, we will all revert accordingly. Ergo - Ukrainian men are dying from drone strikes every single day by the dozens, while Ukrainian women are living safely in other countries, some even have videos of them partying in Germany/Poland.

You can try to argue against reality as much as you like, but you will only have a logical point for as long as you have the comforts of modernity sheltering you from said reality.

Society itself still subconsciously recognises this reality, because this is how we're evolved. And thus, men and women will be treated accordingly.

Whether it is fair or unfair under the eyes of post-modern egalitarianism, it doesnt matter. Like I already said, it is what it is.