The Red Devils chief could not contain his anger during the game – and he subsequently apologised to a young fan who saw his act of fury.
And fans took to social media to laugh at the 55-year-old.
United and Arsenal battled out a draw in an eventful night at Old Trafford.
The Gunners took the lead from a Mustafi header which was then cancelled out two minutes later by Anthony Martial.
And there was just one minute between the third and fourth goals as Jesse Lingard levelled Alexandre Lacazette's strike in second half.
But on the balance of play, Mourinho will be happy with the result against Unai Emery's men – who have now stretched their unbeaten run to 20 under the Spaniard.
United remained in eighth position after the draw.
While Arsenal were leapfrogged by rivals Spurs after their 3-1 win against Southampton and are now fifth.
Meanwhile, Liverpool fought back from a goal down at Burnley to snatch three points.
And Chelsea succumbed to their second loss of the season after being defeated 2-1 at Wolves.
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