In answer to the original question posted in this thread I must confess I'm not really a hard nosed, solid Sox fan but my entire family is and always has been. I, on the other hand, always have been and still am an avid, hardcore Pats fan from day one of their existence, the rest of my family were not. For the most part I think Sox and Pats fans are and were fairly alike.
Up until 2001 both type fans new exactly what to expect rooting for their teams - - - a lot of talk, a lot of excitement and a lot of pain. On the rare occaision when either team made it to the playoffs they would find a way to lose and you KNEW it! It didn't matter if it was really, really close - - - it would always still be NO CIGAR. You also knew it would be another decade or more usually before either team would get another chance. They would be mediocre or downright suck until the next chance. These were the expectations of both team's fans and the expectations were always fully met.
In the fall of 2001 odd things happened, Bledsoe gets hammered and he's replaced by Brady, and after the first game with the Rams that they lost, the Patriots team won their next game and then proceeded to win the next and the next until all of a sudden they were in the superbowl against the same Rams team. As was usual and fully expected, after being lifted to the heights for 3 quarters we end up with the Rams tieing it up in the 4th with a minute and 21 seconds left. Then came the drive, critical pass after critical pass until there's 7 seconds left and the Pats are lined up for the field goal and then, for the first time ever, the Pats did not meet our usual expectations! They didn't botch the snap, the Rams didn't block the kick and run it back for a touchdown and Adam didn't miss. He nailed that sucker dead center and after a 42 year wait the Patriots were World Champions.
In 2004 the Red Sox did the same thing but even I'll admit they did it with more style. They had to not meet their fans expectations by becoming the first team in baseball history to be down 0 and 3 in the Championship Series and then to come back and win the next 4 games against their biggest, most hated rival in the the rival's home park in front of their own fans who had to witness the biggest choke in baseball history. Then they went to the World Series against another arch enemy and swept them in 4 straight to take their first World Series in 86 years under a blood red moon to boot!
In 2003 and 2004 the Pats went to the SuperBowl again and both times they fully met their fans expectations by winning both games. The next time they make it back to the big game, which should be very soon, they will be fully expected to win again.
So to answer the original question I would have to say that most Pats fans think that if the Pats get to the SuperBowl again they will win it and we flat out expect them to win it. I also think that if the Red Sox get back to the World Series their fans will still be thinking the last one was a fluke and they wouldn't be surprised in the least if the Sox lost it because of the 86 years of preconditioning that is still in effect on Red Sox fans.
That's the difference between Pats fans and Red Sox fans, the Pats fans are now optimists and the Red Sox fans will still be pessimists.