You should both be capable of having a discussion without personalising your disagreements. In most cases, the truth lies somewhere in between the extremes of argument - most people reading PPRuNe understand this: Proving, or attempting to prove somebody else wrong does not necessarily validate your own position - in short...
Cool it!!!
P.S. You may believe that you can see through each others user names and know who each other is in the real world. Normally, these assumptions are incorrect - Just in case they're not, I'll remind you that "outing" another user, even if only through carelessness, would result in an immediate and permanent ban.