There was a play last year, maybe against the Texans -- I think it may even have been that Hoss Juke play, where the outside receiver is supposed to run a hitch. Harry runs the route, but the corner is sitting on the hitch. What does he do now?
Earlier in the game Harry ran a poor slant route and got outfought for a pick. Brady went ape. So now Harry is in a different situation, staring at a corner who is sitting on his route. He was probably thinking: "If I run a go here and Tom throws to the hitch, and it gets picked, Tom is going to stab me to death on the field." So he just does what he's told and runs the hitch, which turns out to be the wrong thing also.
Back in the huddle Brady doesn't even look at the kid. Then he throws a fit on the sidelines on national TV. Harry's confidence by then is shot.
This was terrible leadership and exactly why it was time for Brady to go. The Patriots for 20 years had moved on from vets on the downsides of their careers, and replaced them with guys on rookie contracts who couldn't do it as well at first. It's the only way to manage a team if you're planning on competing every year -- you have to cycle through some of those mistakes to allow the cheaper talent to learn.
But Brady was out of patience with coaching up young talent, even when it was by necessity (they were supposed to be leaning on Gordon and AB last year). So he regularly dogged these kids on national TV, throwing his hands in the air, rolling his eyes, etc. This is all the stuff we used to jump on Peyton Manning about.
In preseason it was so obvious that both of the other quarterbacks really enjoyed the young receivers, particularly Meyers. Hoyer came in and on Harry's first play threw him a 50-50 ball, which he caught. Stidham gave Meyers a ton of chances to make plays. Brady meanwhile was bromancing with psychopath Antonio Brown, whose huge salary incidentally handcuffed the team from making any other additions.
Brady is a great player, but he's changed. He once really loved and supported whoever he was in the huddle with. Now he's selective in doling out respect.
Harry is going to be just fine with a different quarterback.