This whole situation kind of sucks, but I still don't really see the reason for the outrage at GJ. Look at this situation from his perspective. If you were in his shoes wouldn't you feel like you kind of got jobbed by coming to UT and feel a little bitter towards the school? He came to school thinking he was going to be playing for an SEC legend and competing for titles, and by the end of his time here, he had endured 2 losing seasons, 3 head coaches and 5 position coaches. Sure, he wasn't the only one who went through this, but keep in mind, these are 18-21 year olds, and all of them are going to handle this type of adversity differently.
Given that he is known to have a personal friendship with TT that stretches much farther back than his relationship with anyone on the current coaching staff, I can see how this could all happen. If you really stop and think about it, what kind of loyalty was he ever shown while he was here in Knoxville such that we should expect the same from him? None. For him it was nothing more than a revolving door of coaches coming through town and leaving.
All that said, it still seems really low of him to be out there actively campaigning for recruits not to come to Knoxville, but drawing from his personal experience, I can at least understand why he might advise a kid to go elsewhere.