What is a 'bad player'?

[Zeref]

The old LS i was in the leader was one of those people, acting like he was the only reason anyone could win a primal fight, than the LS made a party, he came as a healer, and got promptly killed ten seconds into the fight, only thing you can really do is distance yourself from people like that, Elitists are fine if they are actually elites, retarded elitist wannabes are something entirely different and just kill EVERYONE's experience.

Edit:
To add, I don't mind playing with bad players, Hell I'm far from being better than average, I've played with people that didn't know you could avoid hedgemogle's eruption by stepping back or Aldgoat's ram by stepping to the side, and they refused to avoid it even after being told, I'd still party with them again because they were all cool people, the only people I have a problem with are those that are absolutely damn full of themselves to the point where they bring down other people in the party, like Tanks yelling DDs not to DD because they're incapable of holding/pulling hate, or Healers yelling at tanks for getting damaged faster than they can regain mana but they don't use any mana recovery skills, etc....

tl;dr it's not how you play, it's what attitude you bring to the mix.