Personally, I hate O'Reilly because he's an obnoxious asshole who purports to run a talk show, but spends more time poorly promoting his own views than those of his guests, interrupting and dismissing his guests when they don't agree with him. Given that I don't really care what Bill O'Reilly thinks, I simply don't watch him, but his overexposure and unavoidableness cause me to hate everything about him, much like I hate reality TV programming.

I hate most things that George Will and William F. Buckley stand for, but they state their case well and non-histrionically, so I don't hate them. (Though Will has become increasingly reactionary over the years.) On the other hand, I agree with much of what Penn and Teller have to say in Bullshit, but they usually present it so incompetently that it's offensive.