I agree, for even if you re-watch the match it is clear that Arsenal were superior to Manchester United at many points, so the fans' outrage is nothing more than frustration at the defeat. After all, even assuming that their goal would have counted, it wouldn't change anything, for the score is 3-1
North London Derby was entertaining and tough. Both sides displayed their best performance and we had two experienced coach guiding their perspective teams. Arsenal al triumphed over the Red Devils with shocking two goals at injury time. No one sawed that coming, not even Mikel Arteta. Declan Rice making the different with a long shot into the opponent's box and returning Gabriel Jesus from injury doubling it to 3-1 on the scoresheet. Arsenal dominated and missed crucial goal scoring opportunities. It one of the most important game for Gunners and they definitely accumulated the require three points.