I think we all agree that since late in the 2004 season (possibly sooner), there's been a large contingent of Sox fans which are...well, pretty much awful. This article describes that in great (probably too much) brutality. Sox fans in general are now basically seen as another version of Yankees fans, only worse because (1) our team is actually winning now, and (2) most non-Yankees fans sort of liked the Red Sox before the fans became insufferable.
That said, this article is fantastic - probably the best thing ever written about being a Red Sox fan. Check it out.