Most of the bad experiences I've had with people have been in POTD, but that's not really surprising. I just wish people would communicate more. Loading into an instance and it seems rarer and rarer for people to even say hello anymore. I don't have a problem with rushing things, but I do have a problem when people just expect things to be done their way and don't bother to let the group know what they want. A little communication beforehand can go a long way to avoiding problems.

All I can suggest is keep being positive, and remember that not everyone is like that. Negative people can really get you down but coming across them is a bit like stepping in a dog turd. Just wipe it off your feet and move on.