Felger is a contrarian. The only reason he likes Hockey, is because the rest of the town ignored it. When the Bruins were actually playing well, suddenly he become the most critical person in the city AGAINST the B's, and was calling for Claude's head up until he was hoisting the cup.
When people start hating the C's, you will see him turn the other way on them too.
Its his schtick. It's not racism, its just going against what everyone else is saying, to make an entertaining argument.