5) Ray Allen
Ray Allen is a cold-blooded marksman who has torn the hearts out of many fanbases. He won a title with the Celtics in 2008 but that didn’t make him immune to the scorn of fans when he left for Miami. Allen didn't just leave Boston, he also broke some friendships along the way of his departure. It was reported to be a messy breakup between the star shooter and some teammates. Rajon Rondo, in particular, isn't even on speaking terms with Allen. Nor is Kevin Garnett.

One could safely conclude that Allen wasn’t very popular with his teammates. When he played against Boston as a member of the Heat and tried to greet his old team, Kevin Garnett pretended he didn’t exist. Paul Pierce has gone on record and stated that Allen wasn’t really one of the crowd and did his own thing for the most part.
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In hindsight, Allen has nailed quite a few daggers as a member of the Miami Heat. The Boston fans at least know the value of something when it is gone.
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