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You don't need to. By ignoring or laughing at their juvenile antics, and by not engaging them as adults, you win.

I have to disagree. You would win if your position was not absurd. But if you, like Scientology, or for that matter politics and most religion are yourself preaching something quite absurd, then ignoring them is not an effective defense.

If you are a naked king, and there's a crowd that keeps shouting LOL, you gots no clothes on, they are winning.