Except if being jerk in the online game mean you being jerk with some automatons or machine, if that is the case indeed there are distinction between being jerk in internet and being jerk in real life. But since when you being jerk to someone in online game, it mean you hurt, insulted and break the very psychology of a real person, because even though they are online it doesn't mean they are virtual, they are real peoples with feeling.
So when you being jerk online with other real person, it is equal to you being jerk with someone in real life. However in online you get anonymous background, so it is easy for you to being a jerk to someone and get away with it. While in real life you are been exposed, so you think twice before you jerking someone.
There is no different between you insulting someone online or in real life, because the essence is you still insulting real peoples, you still bullying real peoples. So that mean when you being jerk in COD is mean you are not virtually being jerk over there, but you really literally being jerk and crashing other real peoples psychology over there.