This seems like hyperbole to me.
Holy F#@%! Someone online that recognizes hyperbole!
Knock me over with a feather...
That being said; My group actually did this in back in college in a game when the GM (college friend) had a raging DMPC. It was the only way to get across our point!
We got away with it due to the situational circumstances.
In all seriousness... Talk with your GM like a F#@%ing Adult.
Then vote with your feet if they are intractable, and do not change their ways.
Just because hyperbole was used, that doesn't mean that the overall point was not over target...
DMPCs
are raging red flags for a reason.
In @Lanefan's defense, they play a modified version of 1e so a DMPC very well could be equivalent to an NPC in their games.
Then congrats, his system/group is an exception. Exceptions do not disprove the general rule.
Anyone can list off exceptions in any general discussion: "Twilight Cleric? I don't see the problem; we run completely without issue in my game!'
Yeah, buddy: Pat your self on the back. You're that guy, in that group.
But in this current thread, and the many like it in the past bear witness that
in general, and for the overwhelming majority of players that encounter them: The DMPC is bad wrong fun.