I know what you mean. That kind of thing drives me up a wall.
Used to work with a guy that cleared his throat 3X a minute after lunch until 5PM every stinkin' day.
Dick Vitale does this when he's on Mike&Mike. I don't know what that guy eats for breakfast, but for cryin' out loud lay off of it before you go on national freakin' radio, will ya'? He must clear his throat every 10 seconds every time he's on.
It's gotten to the point where I mute Media Player (listen over the internet) whenever I hear them introduce him; and I usually don't get it muted in time to miss the first throat clearing!