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.

You're about to claim all cultures are morally equal. That's indefensible. If a culture practices honor killings, female genital mutilation, or slavery, saying it's "equally valid" doesn't make it true, it makes you complicit in atrocity by moral cowardice. Relativism masquerades as tolerance but actually abandons the victims inside those cultures who reject these practices. You can't simultaneously claim to respect human dignity and claim all cultural norms are equally valid. That's a logical contradiction, not enlightenment. So here's my challenge: name one cultural practice you'd defend as morally equivalent to its alternative, and actually defend it without retreating into vagueness about "context" and "perspective."