Even on Fox there were plenty of shots of Bush side by side with Kerry. In each, Bush was looking at Kerry with disdain and anger. I dont know if he was pissed at what Kerry was saying about him or whether Bush just couldnt believe that he had to debate someone so tototally unqualified for the Presidency. But hearing parts of the debate later on the radio, Bush actually made sense in some parts where he was flayling on TV.
I'm thinking if he was ticked off, it's because he had to restrain himself out of debate strategery. Let kerry attack, making him look like the mean one, and absorb the body blows.
What you've described is exactly how I view Kerry. With disdain and a poor excuse for a candidate with whom W has to waste his time.
Pres. Bush is an emotional guy. He wears his heart on his sleeve so to speak. Of course he was angry. He's human. It's not like he was obnoxious like Al Gore in the 2000 debates.