The French striker, 27, came off the bench in the 86th minute of Brentford’s dramatic 1-1 draw with the Red Devils on Saturday night.
And while he was only on the pitch for the final stages of the game, he still managed to earn himself a booking.
Maupay became embroiled in a wrestling match with McTominay, 27, who ended up nearly pulling the ex-Brighton man’s shirt over his head.
Both were cautioned for the incident – which occurred in the 12th minute of added time after the two late goals.
But Maupay, who has a reputation for winding up opposition players, did not leave it there as he took to social media.
The Brentford attacker shared a picture of McTominay pulling his shirt as he attempted to throw him off.
And he added the caption: “This fan was desperate for my shirt 😂.”
It comes just two months after Maupay riled Tottenham’s James Maddison by performing his darts celebration.
Yet despite his relentless teasing, Maupay defended his actions in February – while also labelling himself the “most disliked player”.
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He told The Times: “People say footballers are boring, then all of a sudden a player does this and everyone goes, ‘Why, Neal?’ ‘He’s the most disliked player.’ Blah blah blah.
“For me, football is a game, it’s entertainment.
“I’m just having fun and, on the pitch, I’m trying to do everything to win.
“If I can say something that puts you off or makes you overthink and make a mistake, I’ll do it.
“People don’t realise how much tension and emotion is involved at the highest level.
“I think it works quite well and if I can get a reaction, great.”