That's fair, but I think there's a clear rule to be applied based on functional and practical considerations, which is to acknowledge that widely held assumptions must be debated in good faith. To take a political example, the majority of people in the world assume that marital unions (which are a feature of virtually every human society) exist primarily for the purpose of birthing and raising children. You can disagree with that premise, you can point out the other areas where society has agreed to deviate from that premise, you can point out the cruel ramifications of that rule in certain cases, etc. But you can't declare that premise ideologically and morally off-limits. Because you can't as a practical matter achieve a functional society by treating a wildly held belief as outside the scope of good faith debate.