Godly parents will never criticize the pastor of their children.
2 Kings 2:23-24 (KJV) And he went up from thence unto Beth-el: and as he was going up by the way, there came forth little children out of the city, and mocked him, and said unto him, Go up, thou bald head; go up, thou bald head. And he turned back, and looked on them, and cursed them in the name of the LORD. And there came forth two she bears out of the wood, and tare forty and two children of them.
Parents will give an account for every idle word and for how their children are raised. However, as the parent must give an account, the Pastor will give an account for the preaching. When you tear the preacher down, you destroy his ability to minister to his children.
Moreover, there are bears in the woods. God may not use a bear to get you, but when you tear the man of God down, God will not take it lightly.