Skip ahead two months. With a crazy gleam in my eye, I chased down a low-level Hordeling in Southshore on my epic mount, hell-bent on mercilessly nuking him to the nearest graveyard. We had never crossed paths before that moment. He hadn't threatened or attacked me. In fact, he was innocently questing when I rode up to drop him like a bad nun's habit.
I stood over his body emoting: /fart, /spit, lol, lol, lol. I wanted the bastard to really feel how much I hated him. He looked grotesque. He smelled bad - in my mind, at least. And his worst crime of all: He was a low-down, dirty, no-good Horde.
Sounds like your typical Alliance toon to me. Notice I say "toon" and not "person" because many of the people who act like arseholes in-game are actually rather nice in RL. I know a lot of people (many of my RL friends) who play Alliance, and I respect their choice (I may be disappointed with it, but I respect it). It doesn't affect the way I socialise with them outside the game, nor should it you. If it does, you have deeper psychological problems that need addressing.
Actually, to be honest, most of these friends have since rerolled Horde due to the average Alliance player age (maturity-wise) being under 12 (usually excluding long-time raiding guilds). I can't generalise too much, because I have come across really nice Alliance players before, they just seem rather rare (on Proudmoore at least). By the way, PvP zealots, PvE is not "care-bear", it's about not being an arsehole to other players just because they clicked the other column when choosing a race. Remember, they're still a person, and the golden rule still applies. Have some honour and common decency when you come across the opposing faction. That goes for both Horde and Alliance, as I know some rather disrespectful Horde players on my realm too (no names mentioned).
I always left people alone, /waved to allies, and yet, I was ganked.
...and this is exactly what I'm talking about. Killing nice people just because they're an easy target makes you a sadist.
Edit:
These guys had alliance characters and told my guildies not to tell anyone that they did or they'll get gkicked.
My raiding guild is ridiculously friendly. There is absolutely zero yelling or nastiness in any raid, and as soon as someone starts getting a bit narky, the raid leader whispers them and tells them to play nice. If someone makes an honest mistake, or is having problems doing their job, there is no public ridicule like in some raids I've been in. The raid leader will generally whisper them and ask them what the problem is and/or if they need help. There needs to be more guilds like that.