I understand the joke, but only because it was explained to me and I have been talking about English and Linguistics with you for, like a decade and a half.  And even then, I think there are enough things where you aren't permissive.  They don't really bother me, since to me, I know you have to ref by the rules of the game that is being played.  (I'm thinking of when I was in legal and capitalized stuff seemingly at random- if you knew all the conventions of medicine and nursing I might still be giving you fits of the vapors).  And I use hyphens apparently unnecessarily.  And there's some latin derivation I'd bet two bits on us disagreeing over (besides the one we already did, which was adulterate.)  
What is your preference/persuasion on AM and PM, by the way?  
So I think that while you think Arrant Pedantry only applies to you ironically, I don't think it's the case that you never correct people.  You just do so with certain rationales in mind.