Eli Manning and Tiki Barber
Manning and Barber starred together for the New York Giants. Initially, they had a good relationship but eventually, it turned sour. That’s because Barber began opening his mouth and complaining about the team to the media. He also lost Manning’s respect when he retired on short notice and left the Giants short.

“It’s just one of those deals. I’m not going to lose any sleep about what Tiki has to say,” Manning said (via ESPN). “I guess I could have questioned his leadership skills last year by calling out the coach and having articles about him retiring in the middle of the season, and he’s lost the heart to play.”