Danny Willett says the behaviour of some home fans at the Ryder Cup proves his brother's controversial magazine article was right.
The Masters champion apologised on the eve of the competition after Pete Willett wrote an article mocking American supporters as "fat, stupid, greedy [and] classless."
That apology did not spare Willett abuse from the galleries at Hazeltine as he lost all three of his matches during Europe's 17-11 defeat.
And as the dust settled on the United States' first win since 2008, Willett posted on Twitter: "Very strange week here at the Ryder Cup.
"Tried my best but played poorly. Unfortunately some American fans showed that @P_J_Willett was in fact correct..
"Nothing to blame my bad play on but still shows that sometimes fans don't know when to call it a day. Shame really!!"
Rory McIlroy also criticised the behaviour of a small proportion of the home crowd on Sunday, saying: "We have no problems with anyone on either team, and really, it's just a very small minority; 95 per cent of the people out there, the American gallery are absolutely fantastic, they really are.
"But this week, at times, it went a little bit too far. But you know, that's to be expected. When you are teeing off at 7:35 in the morning and you're seeing people on the first tee with a beer in their hand and matches aren't finishing until 4:30, 5:00 in the afternoon, I know I would be done at that point. I don't know what I would be saying!
"So it has to be expected. A couple of people out there crossed the line, but we'll take it on the chin. We'll move on and we'll definitely not encourage anything like that to happen in France next time around."