Hmmm...interesting, shanx. In the usual way of things, I don't know anyone who wants to get into an argument with me, so the position doesn't really crop up very often. Adult people should be able to put their differences of opinion across without it turning into a major battle.
I'll always offer my opinion or say what I think, but the only place I can think of, where an argument might necessitate a rounded reply - might be on AB! Lol. Even then, I don't really care if someone thinks they've "won" by me going silent. The truth is, when I've had my say back - I switch off and forget it.