It needs to be a named law: "If you're trying to insult a group of people (especially online), you will make a foolish mistake that proves that you are the idiot." It may be a corollary to Murphy's Law, but it needs its own name. Poe's Law is taken. So is Rule 34. Godwin's Law too. Dare I make the idiot rule "Greenlee's Law?" Nah, I'm sure someone has already taken it, and that's kind of like being Lou Gehrig, Mr. Parkinson or Mr. Alzheimer. Anyway, the idiot rule applies here (and yes, I initially misspelled "idiot" in the headline!).