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A fallacy where someone dismisses all arguments of a person by labeling them a "conspiracy theorist." The label functions as a conversation-ender: if you're a conspiracy theorist, nothing you say needs to be heard. The fallacy lies in treating the label as refutation, ignoring that some conspiracy theories have proven true and that the label is often used to dismiss legitimate inquiry. It's ad hominem by association—using the stigma of "conspiracy theorist" to avoid engagement.
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