The first dungeon I remember doing back in 2.#, I was being made fun of and ridiculed for being a newb in, yes, a low level dungeon. The first FC I was in was run by an abusive player who shat on his raiders all the time, to the point where most members didn't feel comfortable speaking in chat. Eventually the FC broke apart, and you can imagine why.


In other words: there were always asshats and there always will be asshats. New expansions just seem to exacerbate the problem because a huge influx of different types of people flood back in to try it out. Unfortunately, the negative experiences tend to weigh heavier on us than positive experiences, but try not to let it get you down. Just wait it out.


Don't forget that you can blacklist people you were partied with, too, from raids (in your own team) or dungeons or trials. Just go to your contacts list and blacklist the ones that were unpleasant. I was once told by a GM that blacklisting will prevent those "bad apples" from being thrown into your party but I don't know if that applies to alliance raids.


You can also add some new friends this way, too!