Rory McIlroy decided to become "a pain in the a**e" for Greg Norman after the LIV Golf chief executive accused him of having been "brainwashed" by the PGA Tour.
The Northern Irishman has been a fierce critic of the controversial Saudi Arabia-backed circuit, and was recently joined by Tiger Woods in calling for Norman to leave his role.
McIlroy said last month that Norman must "exit stage left" and that the bitter civil war engulfing the sport would not end "unless there's an adult in the room".
Norman recently opted to continue the duo's war of words when speaking to Today's Golfer, saying he paid "zero attention" to the three-time FedEx Cup champion's opinion.
Speaking to the Irish Independent, McIlroy recalled a positive exchange he had with Norman after watching a documentary focused on the Australian's collapse at the 1986 Masters, where Jack Nicklaus edged him out for a one-shot victory.
"It was a bit of an olive branch," McIlroy said. "He came back to me straight away, [saying] 'I really think golf can be a force for good around the world... I know our opinions are not aligned but I'm just trying to create more opportunities for every golfer around the world.'
"Fine. Really nice. Then, a couple of weeks later, he does an interview with The Washington Post and says I've been brainwashed by the PGA Tour.
"We've had this really nice back-and-forth and he says that about me.
"I thought: 'You know what? I'm going to make it my business now to be as much of a pain in his a**e as possible'."