The problem with Sullivan is that you can get to him rather easily. he is quite soft, actually.
It comes across well on the radio. When he gets "caught" saying something stupid or wrong, and he knows it, he starts ranting, and rather whiny-like. At this point, he has to defend himself by ranting on about how much everything and everyone he covers sucks.
When someone gets over on him, it's radio gold to hear how hard he melts down.