I hear ya Smitty but here's the rub...
My concern was always for the players, including the ones with the tool parent/s. To be clear, I would never cave to the pressures of the parents. I would be happy to address the parents directly, separately and at the appropriate time and did so on many occasions. When they wouldn't get their way, they would cry to the AD, principal, school board if they hadn't already. Sometimes this led to a meeting with multiple parties involved. Those meetings were always kept confidential as required by the school and board - so the true story would never get out to the public - only the story the tool parent/s were telling. So, when the tool parents left those meetings still unsatisfied and still un-enlightened, they would turn their venom against the coach/es even more so toward their kid, other parents, other kids, anyone who would listen. Even in those circumstances, the last thing you want to do as a coach is cause divide between a child and mother/father. At that point, I would choose to accept being the bad guy and never reveal the true dirt of the tool parent/s to the child or other players and parents. Ya try to take the high road for the sake of the kid. It can get wearing.
Over the last ten years, I think I outlasted six AD's and four principals. This issue is the primary reason for that churn. The AD's deal with this times twenty to forty sports teams (boys, girls, V, JV, etc.). The principal has to be brought in the loop with any issues brought up by "concerned" parents. As these mostly non-existent issues are brought up more and more, the board starts feeling pressure and flips it back on the principal and AD to keep the parents happy. The AD and principal often have their hands tied as they are required to keep confidentiality. The public RARELY hears of these issues being elevated until it is too late and the coaches either quit or are let go by worn out administration feeling the constant pressure of the small minority of parents making loud noise because their kid isn't getting his/hers.
But it's not the kid's fault. And, throwing the parent/s under the public bus will likely only make things worse for the kid. Our school has made great efforts to try to better educate the parents on having proper perspective with HS sports. Unfortunately, this hasn't stemmed the tide of that louder and louder small minority. We need to figure it out because the trend continues in the wrong direction in our society.