What Josh Harris is going through is not all that uncommon. Many football players experience slander from their coaches.
Last year a wide receiver in the 2013 NFL Draft had his head coach tell NFL scouts that the kid was injured all the time, basically saying he was injury prone. At the regional combine the kid jumped a 40 plus inch vertical and tore up his individual workouts. His hard work earned him a spot on an NFL roster, but that later came to an end. He has never been on a team since. There are many more players that this happens too, but here are the word of Mr. Harris himself.