After watching Hard Knocks AFC North, I started thinking that the Bills really don't have a hated rival. I can't stand the Jets, Dolphins and Pats but it is nothing like Ravens/Bengals Bengals/Steelers, Raiders/Chiefs, etc..
Maybe the Dolphins back in the 80s but even then, it wasn't that heated. Buffalo was terrible during the Pats reign of terror, and the Jets and Dolphins have been terrible even longer. I have a feeling that Pats Bills may heat up this year but we'll see.