Right, it's clear that rp is a jerk and doesn't have a very good sense of how to help his own cause.
That said, however, the guy who muted him this time was clearly out of line and abusing his power (assuming the sshots are real). Regardless of whether or not he's annoying, you can't just mute someone because you don't like them. The guy could have very easily just ignored him, and the problem would have been solved.
Add to the fact that isosceles probably won't be punished just because the person he's abusing isn't in the good graces of the Gms, and you can see why this whole players-as-moderators system lends itself to favoritism and rampant abuse.