Any team that is unbeaten beyond mid October. Every season the utmost priority is protecting '72 as singular. I can tolerate maybe 5 wins to open the season but after that I begin to hate.
Overall the NFL is not important enough to hate specific opponents. You acquire players from across the country and everybody's style of play is mostly the same. Contrast to college football where every result defines a geographical area, a cultural style, a recruiting base, an offensive scheme, and you name it. That's why traveling to a college road game is exponentially more interesting and invested than traveling to a pro game. It's not our team beat your team. It's our area and everything it represents defeated your area and everything you represent. Canes fans sport the 305 shirts and chants while it basically doesn't occur to Dolphin fans.