1. Obnoxious Boston fans. If some Philly fans are violent drunks, some Boston fans are unsurpassed in being arrogant Edited. Profanity and masked profanity are against forum rules and may result in discipline.s. Look at what happened in Fenway last night. 'Nuff said.
2. Boston has had a lot of winning teams lately. Every major sports team has won a title since 2000. The Patriots are a dynasty that ranks up there with the Steelers in the 70s and GB in the 60s. The Cs won a title and almost won a second. The Red Sox broke their 86 year streak and then won 2 more. Even the Bruins won. There's no sympathy anymore for Boston fans and there's an element of "give someone else a turn".
3. The Cs play hard. Some teams and fans don't like it when a winning team plays scrappy. There's a reason why the Pistons were hated. They played hard, borderline dirty at times and teams hated not only losing but getting physically embarrassed on the court.
4. Backlash from liking the Celtics. A few years ago I think there were a bunch of people rooting for KG, PP and Allen to win a title. A couple of years ago I think there was some head nodding and respect given to Brad, Danny and the team for getting the maximum out of a bunch of role players. That tends to turn eventually when that team continues to do well.
5. Not only is this team very good but also has massive assets to improve. It's an embarrassment of riches and there's an element of jealousy from the other fans. Not only do they see the Cs as good or better than their own teams but they know that they have an incredible opportunity that their own teams don't have.