I have no problem at all with northeastern teams or fans. In fact, I generally respect northern pro fans than I do southern guys, because in general, Boston guys root for all the Boston teams, NY guys for NY teams, even to the point where Yankees fans usually root for the Rangers, and Mets fans for the Islanders), Chicago guys for the Chicago teams, Cleveland guys for the Cleveland teams, and so forth. It's not like southern pro fans, who just pick and choose whoever they want -- and what a shock that nobody ever picks the Pittsburgh Pirates or the Cleveland Browns, right?
The Brits call guys like that "glory hunters," which is probably describes those guys better than "frontrunners." Just pull on that ballcap and suddenly all of those championships and all that tradition is yours, baby: "We won! Where can I order my championship shirt?"