What is the most bitter rivalry in the NFL?

The most bitter rivalry in the NFL is between the Green Bay Packers and the Chicago Bears. These two teams have a long history of intense competition and deep rivalry. The bitterness between them stems from their close proximity and the fact that they are two of the oldest teams in the NFL. The Packers and Bears have been playing against each other since 1921, making it one of the oldest rivalries in football. Over the years, the teams have faced each other over 200 times, including playoff matchups. This frequent competition has fueled the bitterness between the two fan bases. Notable examples of the fierce rivalry between the Packers and Bears include the 2010 NFC Championship Game. In this game, the Packers defeated the Bears, earning a spot in the Super Bowl. The loss was particularly bitter for Bears fans, as it prevented them from reaching the biggest stage in football. Another example is the 2013 game when the Packers' quarterback, Aaron Rodgers, returned from an injury to lead his team to a last-minute victory against the Bears. This win not only provoked the frustration of Bears fans but also intensified the rivalry. The intense rivalry between the Packers and Bears is fueled by a desire to outperform and triumph over one another. The teams and their fans display great animosity when they face off, making their games some of the most heated and eagerly anticipated in the NFL.