Cambridge United fought hard to earn a FA Cup fourth round replay as Louis Van Gal claimed everything including the fans was against them.
Goal drought Ramadel Falcao who has been under criticism and Angel Di Maria both went close at the Abbey Stadium.
But Van Gaal's side failed to break down the League Two outfit as they secured a replay at Old Trafford.
"Every aspect of the match is against us – the pitch, the referee. Everything that you can think about this is against you," Van Gaal said.
"The opponents also always give a lot more than normal. Also the fans of course, but that is nice I think and the atmosphere here was fantastic."
FA Cup: Cambridge United 0-0 Man United highlights
The former Netherlands coach felt his side fell into the trap of not playing their natural game in the first half, a mistake he said they also made in the last round against Yeovil Town and in their Premier League game against QPR.
"We make the same error as against Yeovil Town and against QPR, we did the same playing style more or less in the first half," Van Gaal explained.
"Then I have to be angry again [with the team at half-time]. In the second half we did much better but OK we are not out of the Cup. That is the most important thing."
Van Gaal maintains the FA Cup is a key competition for the Red Devils this season with the Premier League title seemingly out of reach.
United last won the competition in 2004 and with no European football this season the 63-year-old remains desperate to progress.
"The FA Cup is very important – it is the most important title for us," added the Dutchman.
"To win the Premier League is much more difficult now, so the FA Cup is our objective also."