Seeing you cannot control a server to be what you see as wrong behavior. I find it a useless act to have server pride. Play with people you find fit your ideals,and be in guilds who show em too, but to want a whole server to represent you is not logical to ask for. Anyone who does feel one persons personal actions reflects a server is a asking for a bit much. No one persons action will ever speak for a server in an MMO.
On a side note, I must agree that leaving a pug raid for any reason, be it they are wiping a lot, you got loot, or real life called, is OK, the raid is filled pretty quickly in most cases.