Grogg of the North
Adventurer
Out of curiosity, have you talked with the rest of the group? Are they as bothered by this behavior as you are?
That's a good point. I was concerned that a preemptive stike might put the player on the defensive and hinder further discussion.
If you know that the player is a problem before you start DMing, you can mitigate it with a social contract and also in your campaign primer. State how you'll run and what you will not tolerate. Outline the specific behaviors that will not be conducive to play. I find that this eliminates a lot of problems before they start when players know what I'm all about regarding my DMing style.
Out of curiosity, have you talked with the rest of the group? Are they as bothered by this behavior as you are?
Like I said, this is my first time being a DM and my group of players are all friends of mine who I've played with before as a player. One in particular tends to always make trouble for our DM (Out of Character actions, getting upset when he can't do something that the DM declares impossible, and not giving the DM his character's backstory).
Talk to him and explain your concerns. Let him know that you want to game with him but that if he causes significant problems, you'll boot him. Then stick to it.
Huh?!not giving the DM his character's backstory