The Argentina winger was hooked at halftime of United's 2-2 draw at Bournemouth.
In the aftermath, Garnacho 'liked' two posts from the host of YouTube channel, The United Stand.
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Mark Goldbridge said: "Garnacho has been one of our best players this season.
"Poor first half but taking him off at half-time and holding him up as the problem is a joke. Many have done much worse week in week out and are still out there."
Then again after Ten Hag's post-match comments, he said: "Ten Hag subtly blaming Garnacho in the post match press conference...not a good look throwing a 19-year-old under the bus who has actually delivered for you this season.
"But then again he's clearly scared of upsetting the bigger earners."
Garnacho 'liked' both posts before later deleting them on his X account.