Hojlund and Walker exchanged heated words just before half-time in Manchester United's 2-1 victory over City, with Walker dramatically falling to the ground during their confrontation.
VAR checked the incident but no violent conduct was deemed as both players were yellow carded for the spat.
' Roy Keane and Gary Neville deemed Walker's actions as "embarrassing" and Hojlund took to Instagram to post his comeback.
Along with the picture of the incident, Hojlund wrote: "Manchester is red; Violets are blue; What a brilliant performance; But the Oscar goes to…"
Trending' Roy Keane:
"Walker must be embarrassed. To go down like that...
"Look at this. I don't know the guy and I am embarrassed for him."