A World Without Men: “Hervana?”

If we had to escape Earth and flee to a new planet, but only half of the human population could go, how would we choose who to save and who we would leave behind?  In an Indubitably plot twist, Josh proposes that we should sacrifice all men, to start over with a female led civilization.  Would this choice save us from the sexism that exists on our planet?  Or is it discriminatory in it of itself?