"/s" means the author knew the joke was not good enough.
In theory I agree, but I pretty much always see it in situations where the author knows someone will say something contrarian/uninformed so they say it first, and put a "/s" at the end.
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In theory I agree, but I pretty much always see it in situations where the author knows someone will say something contrarian/uninformed so they say it first, and put a "/s" at the end.