United beat Liverpool at Old Trafford thanks to two first half goals from Marcus Rashford, yet the statistics from the game confirmed that Jurgen Klopp's visitors had dominated most of the key statistics from the game.
Mourinho was booed by some fans when he took off Rashford for Marouane Fellaini but he said that he was more upset with some supporters criticising young midfielder Scott McTominay when he sought to slow the game down and play the ball back.
Speaking on BT Sport's highlights show on Saturday evening, De Boer had said: "It is a pity that the manager is Mourinho". "Seven matches, seven defeats, zero goals".
De Boer was in charge of Palace for only five games, winning one match in the EFL Cup, but the Eagles failed to score or collect a point in the shortest reign for a Premier League manager.
Mourinho went on to credit United's academy staff and his predecessor Louis van Gaal for their role in Rashford's development and insisted the player remains in safe hands under his own leadership.
"They tried to do the right thing by the fans, in terms of not selling their best player every season, but sadly that did appear to backfire, and that situation probably didn't help the performances in the first half of the season".More news: Professor Stephen Hawking dies, aged 76
"In the situations around the two goals, it was not like it should be - you can not leave a player alone", assessed Klopp.
How did the Liverpool players perform in their 2-1 defeat to Manchester United at Old Trafford? "I think we deserved the three points". He starts some and comes from the bench in others.
It is now up to Manchester United and Chelsea to secure progression. "I'm really happy with Marcus".
"Does he play every match from the start?"
We're starting to play more like a team and Rashford stepping up in Anthony Martial's absence is testament to that.
The two clubs are battling to finish as the best of the rest behind runaway league leaders Manchester City with United second in the table, two points ahead of third-placed Liverpool with nine games remaining in the campaign.