Opposition manager Arsene Wenger even reserved a compliment for De Gea, despite his clear frustration at the result.
When asked if he felt unstoppable, De Gea told MUTV: "Sometimes, you just start a game with a really good save, with a good feeling, you feel that [unstoppable] but we started the game really well, we scored two important goals and it's true that we lost a bit of a control of the game after, but it was a good performance".
Danny Welbeck and Alexandre Lacazette, appealed in vain for penalties and, with his tongue firmly in his cheek, Mourinho said: "I know the pitch is fantastic and maybe breeds a desire to go to the floor".
"The Neymar deal is special for me because it means journalists are not looking at the price any more".
Twitter reacts as Manchester United manage to steal away three points from the more dominant Arsenal, who will be kicking themselves after not being able to capitalise on some serious pressure from start to finish. But we have the experience to get better out of a game like that, you know.
"When you come from where I come from it was like two-vs-two, three-vs-three. But I'm angry and disappointed because in the end we have nothing to show for it", Wenger told a news conference.
United face neighbours City in the Manchester derby at Old Trafford next weekend and are their great rivals' only realistic challengers. "That's very hard to accept".
'We are second and are chasing the top of the table.
After that David De Gea kept them at bay with a goalkeeping masterclass which included a Premier League record-equalling 14 saves, until Lacazette gave them hope.
Jesse Lingard's brace was one of the biggest talking points on the night as the Englishman added to his impressive mid-week showing with a pair of well taken goals but despite this, the real hero for the Red Devils was the Spaniard between the posts. We were not decisive enough. "What I saw was the best goalkeeper in the world".