Even if someone isn't performing you don't be a dick about it. You try and help this person perform better, that's what defines a "good player" - someone willing to help others.

I have no time for bullying at all. The bonus I have is that being the Tank I can usually interject before it gets out of hand. Usually with "Feel free to leave if you have a problem" or "We don't start till this stops". I sound like a 60 year old school teacher but it works. Especially in DF when people are getting forced to skip cutscenes.

Usually there is one big mouth and the party are too scared of confrontation to say anything. If someone's harassing they should be kicked. As a community we are the ones that need to stop it from continuing.