Depends on the noob. If they are an idiot they deserve to taste the steel of my blade. Now if they are just ignorant then I try to aid them, if they just cant get it then they are free game. Generally I am very patient when dealing with noobs.

Now I tend to be a douche in games like RE5 when someone is acting like and idiot and getting me killed alot. I tend to use what ever causes an explosion to take them out.
As of lately I have been going online posing as a new player and when if the person I am playing with acts cocky or what not I break out the big guns and show then whats up.

I remember playing Diablo on battle.net, there were to many hacked characters. I hated PVP players with a passion and I would take them down if I ran across them. Then again some times it back fired; like I said to many hacked players.

There were a few times when I was asked to take vengence for people because of PVPs. Game on and let the winner collect the ear. I had a pretty collection of ears in my inventory by the way.