I hadn't played a game with cross-server DF before. When it was first announced, the 1.0 boards were split between "This'll make getting parties easier" and "DF ruins the community of every game".

Personally, I've had good experiences with it. Quick parties (when I switch to healer) and okay players (though not generally very talkative). The only time I've seen some friction was when the LNC and the WAR both took different paths in Blayfox (the WAR didn't appear to know the location of some coffers) and the War said we should be following him. When it was pointed out he was skipping chests he replied he knew where he was going.

We all just /shrugged, we were here for storyline completion anyway.

As such, I'm witholding judgment on whether Cross Server DF is a good or bad thing. I think single-server DF would be unquestionably a good thing, though.

Back on topic: If someone insults you, report it. If someone is trying to tell you how to do your job better, listen and honestly think about if they are right. If someone isn't performing as you expect, give them friendly advice. If that doesn't work, leave. There is no excuse for calling people names.