The defeat came just hours after Premier League champions Manchester City thrashed Huddersfield Town 6-1, and leaves Jose Mourinho's side with ground to make up on their neighbours just two games into the new season.
The most unforgivable element of this shameful Manchester United performance was this: if there is one quality that United fans expect their players to possess it is the right attitude, yet they were supine here, they surrendered here, they embarrassed themselves and that famous shirt.
"(Yerry) Mina, I don't think he was good enough to play for Man United in my opinion and I think they put their foot down.
"We're Manchester United, we're not going to get held ransom to pay £80-90m for Harry Maguire'". It's a hit for us.
City has already racked up eight goals in the first two games of its title defense. "But we know we can't always play very good but our attitude has to be right, and it wasn't today".
"Look, when I speak about individual displays and am critical with my players, you don't accept it", Mourinho told Sky after the game. Yet United's players were bullied by a 34-year-old in Glenn Murray whose hunger for the ball and for the points simply showed up United's anaemic attitude even more. "I don't want to talk for other people, I think you should ask him", he added. "We can not buy class", Guardiola told reporters.
"If you ask me if my players are, in this moment, happy, I don't think they are". Giggs is now manager of the Wales national side, but while the Welshman would not take the decision lightly to leave his current post, you have to feel a return to United is what he's dreamed of. "I thought both sides of our game were really good".
Manchester City manager Pep Guardiola has shrugged off criticism from Manchester United counterpart Jose Mourinho regarding the club's new behind-the-scenes documentary. My reaction is if you are a rich club you can buy top players, but you cannot buy class. Chris Smalling, trusted to play almost 50 games last season, was on the bench while Phil Jones, who started the FA Cup final in May, was not in the squad at all.
United's hard offseason, notable for the grumpiness of coach Jose Mourinho and the club's struggles in the transfer market, was briefly forgotten about thanks to an opening-day 2-1 win over Leicester last week. Last year, we had nearly the same attitude as today and it's not right.
'I hope that is lost in translation, ' the legendary midfielder said.