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Correct, "Don't tell someone to not do something that you're currently doing." Don't judge another person by a philosophy you're not willing to get judged upon yourself. I certainly agree that the book and the philosophy that this comes from is ridiculous.
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Like I said, that’s one subset. The principle reads stronger. Close to equivalent to “let who he is without sin cast the first stone” a sort of general equivalence of all moral failings. “Don’t judge a murderer if you cursed out loud” etc.