I've never been to Old Trafford, and I completely respect Paul's opinion about the fans there, but when I went to NYC to see the Juve- Man U friendly, I couldnt believe the ignorance of some of their fans.
I know some are just glory-hunting Americans who wouldnt know the EPL from Serie A, but theer were some English fans who made the trip over, and I couldnt begin to tell you how many fights I almost got into during and after the game in the parking lot with these drunken fools...all because I had a Juve shirt on
It wasnt the case 3 days later, where I sat surrounded by many Milan fans, who were all respectful, and shook hands with me at the end of the game