Lack of "common" sense, ignorance. stupidity, in that order.
Clans who misinterpret the words "I'm not interested in joining your clan." as "Oh I want to hear all about it. Plz pester me endlessly!"
Players who use low lvl Jabroga on every spawn forcing everyone else to hunt down individual enemies instead of killing the group as a whole.
Drama
People who stand in the lobby advertising that they're "selling (insert random item here) cheapest in shops." If I want the item I'll search for it and your would be the lowest anyway.
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