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

> Poe's law is an adage of Internet culture which states that, without a clear indicator of the author's intent (such as an emoticon or a disclaimer), it is impossible to create a parody of extreme views so obviously exaggerated that it cannot be mistaken by some readers for a sincere expression of those views. This "law" describes exactly the scenario you've outlined: a joke or satirical statement, especially online where tone and body language are absent, is perpetuated long enough that it reaches an audience not "in on the joke" and is subsequently believed to be a genuine viewpoint.