Are you guys in separate provinces/states/cities or something? Maybe in different countries? If you went to school in Australia and he's from the states and maybe the other two are in Canada, I could see him wanting to be in the same server to chat. If you go to the same university, you see each other on a regular basis, then I don't see the problem with wanting a little bit of separation in a vent server so that you can actually hear each other. He's playing CoD4, God only knows how loud I would get when I played that. Not just from my dying rage, but from laughing at stuff, joking around, etc. I would record it and play it back for him. Play in the same vent server, and let them play CoD and record it all so that he sees "Shit, you can't hear anything the other guy is saying..." and if you're playing a game to have fun, doing good is usually a good way to have fun, and being able to talk leads to doing good.