I think you misunderstood the post.
Everyone was polite and helpful in the thread, and @China_Guy’s the response was:
He was encouraging your husband to make coffee mead, and suggesting how he could possibly save money.
He said you’re not going to be able to taste difference between expensive honey and cheap honey in coffee mead, so if you want to save money buy cheap honey.
Nothing discouraging, nothing disrespectful, so I don’t know what you mean by ‘gatekeeper’.