Well most folks playing in the NFL have had their butts kissed pretty much since high school. So it’s not difficult to see the ego issues.
It’s also why so many have “issues” after retirement when there’s nobody kissing anymore.
There was an episode of 30 for 30 yesterday, during the rainout, and it was about Brian Bosworth. I had no idea what a jerk that guy was during college and the NFL. He earned his short career.