Elkington was watching the U.S. Open before he made a backhanded compliment about McIlroy.
"Rory is so bored playing golf...without Tiger the threshold is prolly 4 majors with 100mill in bank," Elkington tweeted.
McIlroy responded with his own tweet about 30 minutes later.
"More like 200mil...not bad for a "bored" 28 year old...plenty more where that came from," McIlroy wrote.
More like 200mil... not bad for a "bored" 28 year old... plenty more where that came from. pic.twitter.com/R2nigEaee7— Rory McIlroy (@McIlroyRory) June 17, 2017
That tweet included a screenshot of McIlroy's achievements on the course.
He has won two PGA Championships, The Open Championship and the U.S. Open. McIlroy ahs led the PGA Tour in earnings twice, was the PGA Player of the Year in 2012 and 2014 and PGA Tour Player of the Year those same years. He is also a two-time winner of the Vardon Trophy and Byron Nelson Award. The 28-year-old has numerous other trophies.
New you were a money guy— Steve Elkington (@elkpga) June 17, 2017
Jack won 18 and never mentioned his total cash..
It was 5 mill https://t.co/4vTFyUpY7p
"New you were a money guy. Jack [Nicklaus] won 18 and never mentioned his total cash," Elkington responded. "It was 5 mill."
"That's why jack designed 100's of golf courses...and it's knew...mustn't have taught grammar in the 50's," McIlroy replied.
That's why jack designed 100's of golf courses... and it's knew... mustn't have taught grammar in the 50's....— Rory McIlroy (@McIlroyRory) June 17, 2017
But Elkington wasn't done, despite being shown the door by the No. 2 ranked golfer in the world.
He also tweeted that he was "way off" regarding McIlroy's 200 million fortune and agreed when a Twitter user said that McIlroy was "thin skinned."
McIlroy missed the cut at the 2017 U.S. Open but plans to play next week in the Travelers Championship.