See I don't get this hostility thing.
I play World of Warcraft, i have nine lvl70 chars... one of each class. (I was unemployed and needed something fairly cheap to spend a lot of time on). All of them are on Horde, same guild, same server.
Now, certainly, I will endeavour to murderize the Alliance at every opportunity I get, yet one of my best friends plays on Alliance on another server. I don't hate him for it, or even despise him for having gotten further in the game pre the big nerf patch.
It may be that I'm just a mellow kind of guy. Or it may be that as the proud inhabitant of a PvE server, I didn't get ganked, much. I certainly got griefed by a lot of alliance, and ganked when they could, but... meh. I don't care. It's a game. In the end, what I want from it is shiny objects with which to cave mob heads in. I never gank lowbies; I want them to enjoy the game and have rose-coloured specs on so they can get to 70; only THEN will I endeavour to make them bleed from all bodily orifices... of which there will be forty six by the time I am through with them.
Hmm, wait a second. Gnomes. Them I really hate with a vengeance. The player may be Gandhi and be running around giving away flowers, gold and cake; gnomes must all die, regardless. DIIIIIIE gnome, DIIIIIIIE! Go back to Gnomeregan, contract leprosy and ROT IN DIGITAL HELL!