The Reds raced to a two-goal lead in the first half, thanks to Luis Diaz and Mohamed Salah.
Scholes, speaking after the game, said: “There was a lack of fight in this team.
“No quality in the squad.
“I just worry about Manchester United. It’s as bad as I have seen it.
“Where do you go from here? It’s embarrassing.
“As a Manchester United player, you should come away from that game embarrassed.”