i've been guilty of ~a troll too far~ and gettin' really mad at videogames in the past, shit talking, all that. if i pissed someone off or hurt your feelings i'm sorry. i think i've mellowed a bit over the past year or so, though.
that aside though, the nature of this game makes people mad. it requires a LOT of time to become even somewhat proficient (relative to normal games for non-spergs [we are all spergs here, face it]), hours and hours for "basic" melee fighting, and dozens more to become "good". and that amount of time investment makes you care, it's just how it is. i'd be surprised if anyone reading this right now had less than 150 hours in warband. i'm glad i don't have the thing on steam, so i can't see precisely how many days of my life have been thrown away on this game. the other thing is that it's very competitive, even moreso than a shooter or whatever. there's not really any "ambush" except for cav (nerf cav), if you die it's probably because you screwed up somehow.
in a game like this, people are gonna get mad, and strat (diplomacy, backstabbing, clan infighting) exacerbates it. also, since the community is so small, it's not an xbox live situation where the guy you called every name in the book goes away, he's gonna be there in the next thousand games, and on the forums too.
tldr, the way this game works makes people mad, also it's an internet game, and you know how the internet is. just let the shit-talking and the rage roll off you. it'd be nice if everyone would take it a little easier, but whatever - it's just a game, no need to get too worked up about the people playing it.