Running these teams is very difficult. In 12u you have parents who are new and mostly coming out of rec/B teams. They think they know what is going on and they know how to do things. So they sit behind the backstop and trash the coach. This spreads like wildfire and trust me, it gets back to the coaches.
Im not blaming parents entirely. Coaches MUST communicate how things will be handled during the season. Playing time, positions, pitching time..... it all needs to be put out there for these new parents. then the coach MUST do what they say they are going to do. If that parent is still grumbling and the coach has done all they said they would do, it is time for that parents to go bye bye.
if the coach is not doing what they said they would do, then the player has a reason to go bye bye.
This is nothing new. Happens all the time. It happens to some teams every season, it happens to other teams hardly ever. It is the nature of the beast, and like I said, it isnt easy running these teams. It takes a lot of skill to handle all the players , parents, and be able to actually coach a team on the field.