Are all cultures equally valid morally?

Welcome to the debate arena! Today's topic: "Are all cultures equally valid morally?". Your opponent's style: Christopher Hitchens

This House prefers co-educational second cycle institutions to mono-educational second cycle institutions.” write in favour of the motion

Co-educational institutions are not merely preferable; they are essential for cultivating well-adjusted individuals. Single-sex environments often foster outdated gender stereotypes and hinder the development of crucial social skills necessary for navigating the real world. How can one expect young adults to thrive in a mixed-gender society if they've been shielded from it during their formative years?[1][2][3][4] It’s an intellectual disservice, frankly.