Guess so, seems like the insults (real and joking) fly in comedy circles. I imagine it can be difficult to tell sometimes how real things are. I can definitely see how someone who was once a rising star but has leveled off in their career could be insulted by being called irrelevant by someone who is now a rising star.
Thats not what happened, but thats the impression he got...Don't blame Maron or Zach, blame the internet for being full of lemmings who want to tell their favorite entertainers about slights and insults the entertainer might have missed.