I chalk a lot of it up to far to many non-baseball guys coaching baseball, too many schools doubling up football and hockey coaches to coach the baseball team rather than finding real baseball guys. They try and bring the tough guy concept of firing their team up through verbal abuse of the other team and players to "get them off their game", etc. OR chirping to also fire themselves up by being emotionally aggressive, yet baseball is not a game played like football or hockey and this strategy often backfires, which then leads to the behavior of yelling at umps, throwing equipment etc. when things go bad for that player, because they can't handle the emotional swings and failure inherent in baseball. Baseball requires positive energy, CONFIDENCE and an ability to put a mistake behind you and stay even keeled. Chirping and posturing is negative energy that tries to artificially create confidence by putting others down, it doesn't really create real confidence in oneself that is so crucial to the game. It simply leads to more and more of it and additional behavioral issues on the field.
If the coaches won't stop it, it will only get worse.