The Gunners came into the fixture off the back of a resounding derby win over Tottenham, while United were simply looking to get back to winning ways.
It made for an exciting affair at the Theatre of Dreams with some comically poor defending to blame for all four goals that were scored.
During a post-match interview, Jose Mourinho even quipped: “We scored four goals and drew 2-2.”
The result saw United drop even further off the pace in the race for the top four while Arsenal will be disappointed to have missed an opportunity to end their Old Trafford hoodoo.
While the game was packed with controversy, one moment, in particular, caused quite a stir among the fans.
Having skipped past Marouane Fellaini, Arsenal youngster Matteo Guendouzi was hauled back by the big Belgian who grabbed hold of his hair to halt his march.
There was somewhat of an outcry online with fans calling for Fellaini to be banned.
Former Leicester City defender Robert Huth was slapped with a three-game ban for a similar incident in which he was caught tugging on Fellaini’s locks during a tussle in the box two years ago.
However, Fellaini looks set to get away with his dirty shenanigans as Andre Marriner spotted the incident at the time, awarding a free-kick.
Now, Arsenal manager Unai Emery has waded into the debate, but it seems that he isn’t terribly bothered by the lack of action being taken against the lanky Belgian.
Speaking in the aftermath of the game, the Spaniard joked that Guendouzi should take a page out of Fellaini’s book and chop his hair off to avoid future incidents.
“I think the best thing is for the next match for Matteo to cut his hair, and this problem is finished! Like Fellaini. No, I respect the players’ hair a lot.”
“When I was a player it was the same.
“Today, with the cameras, all the situations happening in the 90 minutes can be seen. Some questions are for me between the players on the pitch.
“If it’s not a good action they can receive a card. On the pitch, the situation happened and it’s between the players.”
Well, there you go.
While Emery seems set to let bygones be bygones, you can’t help but feel that a free-kick simply wasn’t enough of a punishment.
It was an ugly incident and Fellaini can consider himself a lucky boy to have got off scot-free