Stephen Nolan yesterday rejected a bid by his Radio Ulster colleague William Crawley to be interviewed over his wages.
Mr Crawley tweeted yesterday morning while Mr Nolan was on the air: "Stephen Nolan has turned down an invitation from @BBCTalkback to be interviewed on today's programme about BBC salaries."
Mr Nolan told his listeners about the tweet: "What I actually said to William is, I think it is really important for the maximum amount of people to have a chance to listen to someone interviewing me, and I think it is therefore important not to go on the smaller phone-in show but to go on the show which has the bigger audience."
In response, Mr Crawley then tweeted: "I well understand that @StephenNolan would prefer to manage a story about himself on his own show rather than face me in an interview today."
Mr Nolan later posted to deny his on-air jibe had been a joke.
He tweeted: "Not joking. Important that I speak on the most listened to show in NI."
Mr Nolan was interviewed yesterday on Radio Ulster's Evening Extra and BBC Radio Foyle.