Poe's law is an adage of Internet culture which says that, without a clear indicator of the author's intent, any parodic or sarcastic expression of extreme views can be mistaken by some readers for a sincere expression of those views.

https://en.wikipedia.org/wiki/Poe%27s_law

Poe's law is based on a comment written by Nathan Poe in 2005 on christianforums.com, an Internet forum on Christianity. The message was posted during a debate on creationism, where a previous poster had remarked to another user: "Good thing you included the winky. Otherwise people might think you are serious".[4]

The reply by Nathan Poe read:[1]

Without a winking smiley or other blatant display of humor, it is utterly impossible to parody a Creationist in such a way that someone won't mistake for the genuine article.

The original statement of Poe's law referred specifically to creationism, but it has since been generalized to apply to any kind of fundamentalism or extremism.[3]

[–] Hyphlosion@lemm.ee 4 points 1 day ago

Since when is Poe making laws? I thought he’s an X-Wing pilot.