I'm not defending Jay and I have a ton of respect for Hester. Also I wasn't there and don't know what happened in the locker room, but Jay had a thing that if you weren't doing what you were supposed to do, weren't where you were supposed to be, or if you dropped the rock when he needed you, he kinda gave up on you. Remember some of those years Cutler was getting beat-up pretty bad, so if you didn't deliver when he threw you the rock or weren't there when he needed you, he probably was pretty angry about it. A QB has to feel like he can count on you. Which is one of the reasons he liked Earl Bennett so much; not only did he have the rapport from college, but Earl got open and was a technician with his routes. Earl's main problem was he couldn't stay healthy.
I confess that I've personally experienced that loss of confidence from a QB because I could get open like a mofo (especially deep), but I dropped the ball too many times.
It's not like he went on and had killer years as a receiver anywhere else:
2014 Atlanta 38 catches for 504 yards
2015 Atlanta 0 catches for 0 yards
2016 Baltimore 0 catches for 0 yards
2016 Seattle 0 catches for 0 yards
Remember Hester was a listed as a returner, WR, and CB in college- which to me basically means he was so fast and electric with the ball in his hands but maybe didn't have the exact positions nailed down outside of return-guy.
Again, I mean no disrespect to Hester; I believe he belongs in the Hall of Fame. But as a receiver? No, he wouldn't even start for most teams.