Too funny (actually your whole report had me laughing, it is so relatable and you bring to life many of my own experiences). I have a couple of JA friends (that are guys) exactly same way--arguing things that really aren't worth arguing that they are dead sure about in not-budging-stuborness--when I know for a fact they are wrong. And even when I stack the facts against their argument they remain rooted to their story. Usually after one volley I just shrug but sometimes I just have to get into it--usually with no meaningful outcome.