With tempers evidently flared, McGregor proceeds to down a shot of his whiskey with the other drinkers before suddenly aiming a left fist at the temple of the man.
To his credit, the old man barely even reacts to the punch and McGregor is immediately dragged out of the pub by two of his friends.
"When you deal with fighters, guys who fight for a living, there's always something", UFC president Dana White told United States sports broadcaster Jim Rome as he discussed McGregor's latest incident.
Well, since then, White was a guest on The Jim Rome Show. "But yeah he (appears) to punch an older man in the face".
TMZ reported Ireland cops are investigating the incident, noting "no arrests have been made to date". "If you look at some of the greatest - Tyson". Yeah, a lot. But, this is a high-profile guy" White said "The bottom line is when you're not a regular guy, you're a high-profile guy, and you're a professional fighter, you can't do it.
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"Get ready for a disaster".
According to the New York Times: "McGregor has not been charged with a crime".
McGregor hasn't fought since his submission defeat to Nurmagomedov last October, but he's desperate to return to the famed Octagon.
Conor McGregor doesn't take too kindly to people who insult his whiskey.
One month before this altercation, McGregor was caught on video smashing a fan's phone outside of a Miami nightclub.