Rory is just pissed at the crowd and you can't blame him as It's full of complete imbeciles. The commentators are moaning about them constantly, the on course commentators are moaning about them, you can hear the sheer stupidity in the comments and chants being shouted. Also, you have been able to hear on numerous occasions the on course officials shouting at people to be quiet, have some respect and saying they are searching for the bigger muppets to throw them out. It's no wonder Rory is acting the way he is. Sergio is not far behind him either. They can't let the crowd get to them.
Don't get me wrong, there's nothing wrong with high spirits, banter and joking around and nothing wrong with cheering your team on, but many are going way too far and some of the crowd are seriously reminding me of Happy Gilmore. You can tell that many normal fans at the event will be just as annoyed at the numpties as the players, officials, commentators and the rest of us viewers are.
It's always the same when the Ryder Cup is in the States so it's no surprise really.