Europe's Danny Willett believes his brother was right when he criticised American golf fans at the Ryder Cup.

In an article prior to USA's 17-11 win at Hazeltine, the Masters champion's brother PJ called the home supporters a baying mob of imbeciles.

In a tweet, Willet says it's a shame as "sometimes fans don't know when to call it a day".

The behaviour of the partisan American crowd has drawn plenty of debate, with a number of players booed and heckled throughout the tournament.