You may think you're a great father, but I don't know you. You're a stranger to me. I don't have any reason to believe you're any better than the last 20 people who tried to offer me contradictory unsolicited advice on how I should raise my children.
There is at this point no faster way to get in my bad books than to put your nose in my affairs and tell me how to raise my children when I didn't ask you to.