As a former MS coach myself, I do not like agendas, but there are also parents with agendas, and I could share a list of ridiculous situations in that as well. Still, we had the power as coaches, and the parents, when they behaved in a ridiculous manner, could only harm their own kids. I feel bad for the kids, as the real world doesn't work like their parents seem to think it should. Since we had the backing of the HS coaches who oversaw us, we or the other players were not affected.
In your case, at least it isn't the HS coach. I'd hate for a kid to have their final years (as most stop after HS) be miserable.