In fact, it is very possible that he was furious after the second half of yet another match where United murdered the opposition but were still sweating toward the end.
Why would that be? Why were we watching "deja vu" reminding us of the Arsenal match which United walked but had to squeak a 2-1 result.
The answer is twofold: despite winning 3-1, they should have been at least five up by the interval and finished at least eight to the good; second, they became casual, unprofessional and sloppy in the second half.
Frankly, this won't do. It was hardly surprising that supporters started to flood out with more than 10 minutes to go. For the neutral, it was probably a pretty exciting match. For United fans, it was frustrating and nerve-wracking, despite the result.
Nevertheless, this should not disguise the fact that, with Vidic back, and taking the view that this was an off day for the strikers, there is no reason why United can't win the Premier League title.
Yes, there were individual errors, but once again, like last Sunday, United were a team. Attacking, they flowed as one unit, displaying the pacy, interchanging one-touch football that Sir Alex is seeking.
There are some people who are becoming bored with "tiki-taka" football. Technically it's impressive; when it doesn't produce goals, it's about as boring as watching an old "Catenaccio" Italian game.
Brendan Rodgers has brought "pass, pass, pass" to Liverpool with insufficient end product. Their supporters are tearing their hair out.
By contrast, United, and indeed City, playing their skilful game, with top players, at pace, are more entertaining with a better end product.
It looks like being a "tale of one City" this season, with two Manchester and no London clubs slugging it out to the end. Despite Saturday's frustrating show, United will surely prevail.
So what did we learn?