Steer clear of the victim, who exudes "poor me". This person always comes to you when having problems for advice, and lets you know in no uncertain terms how much hardship they are going through (often blown well out of proportion to the facts). But when you need advice or would like to vent, they're very short with you. So it's not fair when you don't mind spending two hours plus to cool them down––instead, for you, it's like five minutes. You're not a therapist, so don't let them air their grievances at your expense.