As for your comments about the coach in question, I’m unaware of the details but would caution you that you are walking very close to needing legal representation with claims like that. I believe a defamation case If your comments are untrue would be a slam dunk. Luckily any adult can see thru them as “hate speech” towards a club you despise.
My experiences and opinions of the coach are my own but are very true. I recommended that the poster could/should talk to the parents of boys on the two teams that requested a new coach. I do not believe their opinions and desire for a new coach amounted to their defaming the coach.
Perhaps shaming children and saying they don't have the talent to make top teams would be a better case for defamation if untrue.