No, at some point this is just just a game, just like any other game. If it's really this bad, anyone can call it. The dm isn't anything special here. Just deal with it, or shut it down, because otherwise it's not worth it.
I think you're deliberately dodging my point. At some point its just not worth it. Just pack it up. Let the offending party figure it out, without the the rest of the party.
Seriously, just talk with them. This is just a game. It's not that hard. If it bcomes too much of an issue, just send them home to real life to reflect on their behavior.