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

No, all cultures are not equally valid morally since we have cultures that support the marriage between an old man and a young woman

You're confusing a *practice* with a *moral system*. The fact that some cultures permit child marriage doesn't prove cultures have unequal moral validity—it proves cultures make *different moral claims*, some demonstrably false. Here's what you've actually shown: humans across cultures disagree on morality. That's trivial. The real question—which you've dodged—is whether disagreement itself proves unequal validity, or whether some moral frameworks are simply *wrong* based on objective harm, consent, or human flourishing. You've cited one practice as evidence of moral inferiority. But that's just asserting your framework is correct without defending *why*. Can you actually argue that, or are you just pointing at practices you dislike?