I'm currently running a 6 person World of Darkness campaign, which is heavily social based. 5 of the players I am happy with, but one of them keeps doing stupid things, such as pushing himself to the point of unconsciousness (via a curse the party are under) to prove a point, and then falling unconscious in the bad part of town with a very glitzy sword on his hip. I didn't take the sword from him because at the time it felt as if I would only be doing it to 'get back at him' so to speak.
Since then, another player has raised the point that had any of the other characters been in that situation, I probably would have had their sword stolen, and expected them to either accept that it was their own fault, or try and get it back somehow. But because I felt it would be picking on him, I let him get away with more than everyone else.
UPDATE: After reading the advice here, I decided to let the natural consequences of his actions take place, and see what happens. This resulted in him attacking and killing a fairly important NPC who they were attempting to get information from. When the rest of the party found out, they were frustrated at him for his actions (IC and slightly OOC as well). His defence was that he "didn't have a choice", and to try and pass the 'blame' to me, going as far as to be slightly annoyed with me after the game for "forcing him into that situation". The events played out that he entered an elevator with the NPC, pulled a sword on him, and attacked, expecting the NPC to immediately beg for mercy. Instead, the NPC fought back, but was disarmed and then killed.
I still am unsure what to do about this player, as he seems to want to do things which are a little stupid, with no consequences.