Kagisho Dikgacoi was sent off and conceded a penalty as Crystal Palace slumped to a 2-0 defeat at Old Trafford, but the Eagles boss refused to criticise the officials
The 50-year-old was forced to watch from the stands at Old Trafford after being banned from the touchline for two matches following an improper conduct charge by the Football Association for comments made in the wake of the Eagles' loss against Tottenham.
Holloway had been heavily critical of the decision to award Spurs a penalty and, after United were awarded a decisive penalty that also saw Kagisho Dikgacoi sent off, Holloway opted to remain tight-lipped this time.
"My opinion doesn't count because the result is the result and I have just got to deal with it," he told BT Sport.
"I literally can't afford it so I can't say a word [about the penalty and sending off] and let everyone else judge it.
"He [the referee] has a difficult job to do though, especially at Old Trafford which such a noisy partisan crowd.
"I am very disappointed we lost the game but not in the manner in which we lost it or the way my players behaved and conducted themselves."
Robin van Persie scored the spot-kick to give United the lead just before half-time, with the reigning Premier League champions having to wait until the 80th minute to double their advantage against 10-man Palace.