Almost all the fans behaved impeccably. That was my observation as someone who attended the U.S. Open throughout the entire week. There were some isolated examples of poor behavior by a handful of fans; but, they were exactly that--isolated.
In case some of you haven't figured out, I'm not really suggesting that New York fans are the most knowledgable fans in golf. I presumed my original post illustrated that. But generally speaking, I found the fans to be friendly and genuinely interested in golf--if not necessarily knowledgable or well-versed in the customs of the game.
There was some playful bantering with players throughout the tournament; but, it was mostly good-natured. It seemed that the intent of most comments made to players was to make them chuckle or lighten the mood--certainly not to affect their game detrimentally. Occasionally, fans were too enthusiastic rooting for Mickelson. But, again, I don't think the intent was to throw Goosen off his game. It was tacky at times; but, I accepted that there wasn't any malice behind it. Goosen seemed to accept that, as well.
Characterizing the fans at Shinnecock as unruly or rude is fundamentally unfair and entirely inaccurate. That would be akin to characterizing British fans as naked because of a few streakers! We're talking about a handful of lunatics in each case. It certainly doesn't justify condemning everyone.