I was with a couple of ex-players from one of my successful high school baseball teams and they were reminiscing about their glory days. What threw me during their conversation was their biggest memory of high school baseball. It wasn't a particular game or an accomplishment during a game, rather it was me having a meltdown in an indoor practice that they remembered.
It reinforced my belief that when you are a coach and players respect and look up to you, you must always act in an exemplary fashion because like or not you are in a position of a role model.
You must leave a positive impression no matter the ages of your players, because they see and hear everything that you do and say. Being physically and/or verbally abusive will make your team believe that is correct coaching behavior and it will repeat itself if they choose to coach, which would be damaging and irresponsible to the next generation of athletes.