I was a college teacher all my working life, and many of my family have been or are now teachers and coaches. "Criticism" comes in many flavors. Whenever its source is simple self-generated explosive emotion [whether the criticism is somehow "correct" or not], it tends to be unhelpful if not all the way to inhuman and counterproductive. We are ourselves humans [presumably most on this board are anyway], and so we will inappropriately allow our own self-centered emotions to spew out in what we will call "criticism", but which is more simply ourselves releasing self-created stresses. Criticism should be for the benefit of the criticized, if one is a teacher or a coach, and not just a self-primal-scream-therapy act.
Fans. a term that I will use to mean those who want a team to win some contest regardless of any feelings than their own, will "naturally" express displeasure without regard to any larger concerns. Although such self-oriented behavior is "understandable" in some sense, it cannot be viewed either as noble nor consciously oriented towards helping the larger good.
Teachers and coaches have greater responsibility, as it is their profession, even their vocation, to consider the development of the individual before their own mindless reactions. We all fail occasionally at this, as we are humans too, and frustration can get pretty onerous. Coach Kelly REALLY cares about many things. The top two of these are the development of the young athletes in his charge as both men and skilled football players; and secondly that the team succeeds [which reduces in the final analysis to the same thing as the first]. Nevertheless, the ripsaw effect between growth-of-team and growth-of-player creates difficult moments. Thus his occasional explosions.
Coach realizes that he shouldn't unconsciously explode at all. Almost every time he rapidly gets hold of himself, grabs the player, and begins to teach. Kelly's a deeply caring guy. I believe that he demonstrates that to the players every day. They know that he's going to act instinctively some times, but that he's got them and the team always in sight and heart, so they, like myself, respect him even knowing that he will blow-up once in a while.