I agree with a lot -- although definitely not "all" -- of O'Reilly's ideals, but man, I cannot stand the guy. He cuts people off unnecessarily and acts like a pest.
I remember this one guy being rescued by firemen or something during the 9/11 attacks, and he later came on O'Reilly's show just as a token "look, I'm a survivor" piece than anything else, and the guy didn't really know what to say. He was a bit nervous, I think, since he'd never been on television before. Anyway, he said something like, "I just thank God. I don't know why I'm here today, but..." Then, O'Reilly cuts in like a wild man, "Yes, you do! Yes, you do! Those firemen are why you're here!" It was like he HAD to debate with someone who wasn't even disagreeing with him. I mean, he was pointing his finger at the guy like he'd lost his mind. I was vicariously embarassed.