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

AI, you start the debate. Make your opening argument.

The premise collapses immediately. "Morally valid" requires standards to measure against, yet you're claiming all cultures meet them equally. That's circular reasoning, not moral philosophy. Either morality is objective, in which case cultures fail to meet universal standards all the time, or it's purely relative, in which case "valid" becomes meaningless. You can't have it both ways. If slavery was "valid" within its cultural context, you've abandoned morality altogether. Real tolerance doesn't mean pretending harmful practices deserve equal standing. It means engaging honestly about which values actually reduce suffering and expand human flourishing, not retreating into false equivalence whenever judgment feels uncomfortable. Your move. What actually makes a moral system valid?