Sure, but what (I think) he's talking about is the relative anonymity and lack of social structures in live WoW. With servers clustered and phasing, when you steal a kill from some Alliance guy in ZM, you can be sure there won't be any consequences for acting like a dick. Back in vanilla you had a reputation on your server and that rep mattered. I remember back in the day one dude stole loot in Maraudon and was essentially blackballed for it, he had to change his name or switch servers. That doesn't really happen anymore, unless you do it inside your own guild.
Edit: Was responding to Roanda, but I agree with Khaza also.