The 33-year-old held the solo lead at the second FedExCup Playoffs event, and looked incredibly comfortable through 36 holes.
Yet when things went south in the third round on Sunday — Simpson fired a five-over 76, which included a double bogey and a bogey on holes Nos. 15-16 — one spectator let him have it.
The fan had apparently been bad-mouthing Simpson for several holes and had “been a problem for a while.” Right after Simpson hit his approach shot on No. 18, his caddie, Paul Tesori, had heard enough.
Tesori walked over to the ropes and let the fan, who had a beer in hand, have it — and the majority of the exchange was caught on the NBC broadcast.
The fan didn’t seem to do much to defend himself, either.
As Tesori was finishing up and walking back into the fairway, he waved over a police officer working the event and had the fan ejected.
Simpson bounced back slightly and shot a 3-over 74 on Monday in the final round.
His playing partner on Saturday, though, seemed unfazed by the incident on No. 18.
Tyrell Hatton, who at one point shared the lead at TPC Boston, waited for the fan to be removed before hitting his approach shot. And, well, he nearly holed out.
— PGA TOUR (@PGATOUR) September 2, 2018
Simpson finished 3-under in a tie for 49th. Bryson DeChambeau, who won last week at The Northern Trust, won the Dell Technologies Championship by two strokes.
More from Yahoo Sports:
• Broncos cut QB they thought would lead franchise
• Gruden makes his case for Raiders’ shocking trade
• Nick Saban apologizes for postgame conduct
• MLB postseason picture takes shape