Fair enough I'm certainly pointing at the obvious but do know it's a generalization for the most part. But sorry, I won't say its equal because with the Pats and Sox since 2000 or so it's the majority of fans who are insufferable. That may be because most of them were not part of this mystical Nation until the actually won something and I do believe this to be true.
No matter there's plenty everywhere for all teams. I'm not a "NY" Yankee fan but a CT one so I had so many friends growing up who were the opposite it was actually fun. Part of that was when were were growing up they both sucked LOL. We all kind of were elated to have any kind of success even if it were to stay in the race until the last month.
I think some of it is Boston is jealous about NY, despite the difference in sucktitude in NY sports and success in Boston sports. Beating the Yankees and chanting Yankees suck is fine, constantly talking about the Yankees during the world series or after you won a title is just dumb, I dont even get mad about it I just feel sorry that fans have to think of the Yankees instead of celebrating their teams success so its on them. How about fans chanting Yankees suck at a teams Super Bowl parade so I say hey your just giving the Yankees more power. I dont need to wear a shirt that says this team sucks and chant their name to enjoy my teams success when it happens.
NY fans are obnoxious and Boston fans are bitter. The difference is NY fans admit it while Boston fans will dance around the fact that they are bitter. A lot of the bitter Boston fans are from Boston or the neighboring towns around it. Kind of goes with the city New Yorkers are rude and obnoxious and Boston is bitter and despite the their teams success they are still bitter.