kintori:  Is there something in the concept of a "game" that escapes you?  You're taking this waaaay too seriously.  Moreover, I would dispute the existence of any "social contract", particularly one in which the terms are dictated by you.

I admit I have no knowledge of the situation you describe, and if I did I might be offended by a player's conduct.  But to elevate this to a moral level is overkill.