The striker has struggled with form and injury this season.
One fan complained to Mir, posting to social media: "What are you going to teach, how not to have an attitude on the field? Or how to be earning a fortune on one team and wishing you were on another and being unmotivated?"
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Mir responded first with a series of laughing emojis.
He then posted: "Enough of all this nonsense! You have no idea!"