For me, it depends on if it's a rant/vent disguised as a "story." Or, if a story just turns into pages and pages of mocking the person in the OPost that made an etiquette blunder. That seems out of place here.
I *do* happen to think that posts in the etiquette section of the forum should have some sort of etiquette question in them. I think it's ok to ask the OP what the etiquette dilemma is and if there isn't one, suggest the thread me moved. Of course, this should be done with as much kindness as possible. I've only once seen it done in a rude way and it was done by a very new member, who may not have known better. JMO, YMMV.
eta: I think I understand now a bit more specifically. When someone has made a simple posting mistake, it's probably best to just PM them instead of posting in the thread at all.