Alejandro Garnacho liked two posts criticising Erik ten Hag after Man United's 2-2 draw against Bournemouth.
United struggled at the Vitality Stadium, but earned a point thanks to Bruno Fernandes' brace.
It was another uninspiring performance in a season of many, and Ten Hag introduced Amad Diallo at the break in an attempt to turn the tide, with United 2-1 down at half time.
However, the Dutchman sacrificed Garnacho for Diallo, and the Argentine seemingly expressed his anger post-match.
Tweets from renowned United fan Mark Goldbridge criticised both Ten Hag's decision to withdraw Garnacho along with his post-match comments when he implied the Argentine's work rate was a reason for taking him off.