I can't stand most talk radio. Besides the fact that everyone is always shouting, it hardly seems that anyone ever really hears anything anyone else says. P.J. O'Rourke wrote a column for the Atlantic about this.
On-line religious discussion tends in the same direction, plus the side channel of out-and-out sermons. Well, I suppose there are enough disfunctional people involved who simply don't realize that there's someone at another keyboard to whom they are talking. But all too often I see messages arguing against imaginary opponents. What's the point of arguing with someone if you aren't going to argue with them?
I suspect, sadly, that a lot of the argument is actually about self-righteousness. The point seems to be not to convince anyone else, but just to have stated the Right Dogma, thereby identifying onesself as one of the Elect/Saved/whatever. I say, "Why bother?" God already knows what you believe, after all.