There are plenty of conservatives in New England (the broader area are constituents of this team, not just Bostonians). There are conservative counties in Mass, just as there are in CA.
Doesn't mean these posters were conservatives though. It's just an unknown.
Nor is this an especially big news story since there are all manner of cretins and asshats online. The only broader significance is that blacks have always had barriers to entry in every professional sport. I guess hockey is the last "white man's" professional sport that is popular in north America. This, however, is nothing compared to what blacks faced with baseball in the early to middle 20th century.
- wolf