Scruffy nerf herder
Toaster Loving AdMech Boi
I would have voted "I look upon it with the loathing that amounts to absolute detestation"
I have lots of interpersonal conflict in real life - I like to play my games and enjoy getting to put that behind me and group up with a bunch of friends to co-operatively beat up demons, devils or supervillains.
I've not had to in my group, but as a GM I would absolutely forbid it, and repeated occurrences by a single player would get that player kicked from my game.
Edit - I have had this happen twice (a long time ago), I'd ask the players to play as a group, no PVP (as that was part of the description of the game when I set it up and recruited players). Both times, it kept going, so I cancelled both games. No gaming is better than bad gaming.
So is it a totally foreign idea to you that for some players it doesn't compromise fun time at all and is literally in no way "interpersonal conflict" (this is a friendly and honest, not rhetorical, question)? It's a game. We're making cooperative fiction.