48. Le’Veon Bell
Bell arguably had the most moronic approaches to a contract holdout ever. He lit up the NFL with the Steelers before overestimating his value. This led to him sitting out for the entire 2018 season after he refused to sign the franchise tag. Then they traded him to the New York Jets.
The running back ruined his career by moving to a dysfunctional franchise. He also let down his teammates because they expected him to play a key role. In the end, he failed to deliver on the field and disappointed the fans (via Independent).