No amount of evidence will ever persuade an idiot.
Never argue with stupid people. They will drag you down to their level and then beat you with experience.
This line is widely circulated under this name. It may be a paraphrase, a later coinage, or a doubtful ascription. It stays because the collection used it; treat the byline as traditional, not proven.
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Never argue with stupid people. They will drag you down to their level and then beat you with experience.
Mark Twain
The Commonplace