It is the rare parent that can assess their children dispassionately. Second guessing coaches is nearly a sport to itself - what would sports radio be without that? With a personal stake to amplify matters HS baseball is worse.
My rule of thumb was - the closer you stand to home plate during a HS baseball game is in direct proportion to how much you want to wallow in banal self interested chatter about the genetic flaws, stupidity and lack of talent of every participant on the field - EXCEPT little Johnny.
My tolerance level was half way between the bag and the foul pole on the baselines. So about 150 feet from ground zero behind the backstop - or from the concession. I used to send my little kids for the hot dogs because I'd lose my apatite (and patience) if I got too close to the noise.