He was not discussing the show or listening to it loudly. He had it on his headphones!
It's a crapshoot my FRiend. Roll the dice and pay the price of admission to human nature in the workplace hierarchy. Who's going to win a pissing match between boss and underling? What side will the top floor take: the boss or the underling? How will arguing over headphones during work hours translate to those wondering why work isn't done? Perception is reality. And the fellow could just as easily download the radio program to listen to in the car or at home.
As I said before, Hannity (or Rush or John Gibson) will not see any effect in their bottom line if the guy/girl listened to the program at a more opportune time. Nor will this problem at the office affect Sean, Rush, or John Gibson's wallet. BUT IT WILL AFFECT THE PERSON ARGUING WITH THE BOSS OVER HEADPHONES, RADIO STATIONS, and such. The person may not get the promotion, may be the first to be laid off, or may even be fired for "something unrelated" which is silly...why put yourself in that position. Turn it off. It's simple and it stops all arguments.
This is not an issue of lib vs. conservative; this is common sense workplace behavior.