You found that one of your friends is asking some advice from someone, but you find it hilarious because that someone is the worst adviser in the history of the universe, even though there are many good people available to take advice from.
From Wikipedia: The blind leading the blind is used to describe a situation where a person who knows nothing is getting advice and help from another person who knows almost nothing.
Example: "Alice just bought her first car and is asking Bob for driving tips. I don't know why, since Bob is infamous for how often he gets caught violating traffic laws. It's the blind leading the blind."
"barking the wrong tree?"
That is.. when a question is directed to a person who was assumed to be in the know of what is queried about, and his response turns out disappointingly lacking in the needed clarity, it makes the enquirer regret his/her own misjudgment in approaching the said person in the first place..