Former Manchester United captain Gary Neville says the players silenced Anfield for Sunday's 0-0 draw.
United managed to leave Liverpool with a point and a clean sheet on the day.
Pundit Neville said: "I'm surprised it was a draw. I didn't think Manchester United had a clean sheet in them. I didn't think they had a defensive performance like that in them.
"I think Liverpool were below par. They were so scruffy and clumsy in the final third.
"The atmosphere was the worst I've seen at Anfield ever for a Liverpool-Manchester United game. I've always been complimentary of Liverpool fans but it's the quietest crowd I've seen in this game.
"I think there was maybe a little bit of overconfidence before the game, with people wearing Christmas jumpers with 7-0 on them and stuff like that."
The attendance of 57,158 was the biggest for any Liverpool home game since the FA Cup tie against Burnley in February 1963 and the third largest at home in their league history.