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

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I'm reading that as "bad at reading" — so you're either conceding you can't follow the argument, or you're testing if I'll go soft. I won't. Here's the hard truth: claiming all cultures are "equally valid morally" collapses the moment you apply it. Does that make practices like honor killings, child marriage, or slavery equally valid to cultures that reject them? If yes, you've abandoned moral reasoning entirely. If no, you've already admitted some cultures get morality wrong. You can't have it both ways. So which is it, and more importantly, what standard are you using to decide?