you brought it on yourself miss twiddle

I am pretty cynical about this kind of thing: if I were to see an error of that type, I would assume it was because the author didn't know any better. HOWEVER, I suppose I would give leeway if it was super-obvious the author was just doing it for effect (which, now that I think about it, would probably require a narrator to correct the character in passing, just so the reader knows that they know better), or something like that. Or if it was an author I really, really like, I would assume that it was characterization only because surely my favorite author can do no wrong!