The Glaswegian midfielder, 26, was livid after being hauled-off in the Old Firm derby after just 40 minutes of the Scottish Cup semi-final.
Fans took to Twitter to suggest Halliday's language was somewhat less than appropriate for his own manager.
One fan even claimed Halliday appeared to yell: "Ye f***ing bawbag."
Rangers were trailing 2-0 at the time of being subbed – with Murty appearing to pull Halliday out of the action after struggling on the pitch.
Ross McCrorie was then sent-off early in the second-half for pulling-down Moussa Dembele in the penalty area.
Dembele then stepped up and smashed home the spot kick to put Celtic 3-0 up in the cup semi.
The Hoops went on to win the Scottish Cup last-four showdown 4-0, thanks to a late penalty from Olivier Ntcham.
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However, fans on Twitter were still obsessed with Halliday's incredible reaction to being substituted.
Here's what they had to say on the situation…
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