Don't sweat the 'tude; this site seems to bring out in folks the need to not just give opinion, but club you over the head like a baby seal with theirs. I'm not sure why. I do recall that the article in a bike magazine about this website specifically mentioned this tendency.mseanschmidt said:
"OP" usually means "original poster," or "other person"; I've seen both uses.
IMHO ("in my humble opinion"