Getafe were swatted aside with ease in the Copa dey Rey on Tuesday in a 3-1 defeat by Sevilla.
Greenwood started on the right flank but had a quiet game, lasting the full 90 minutes but hardly having a kick.
Ramos, meanwhile, dominated in defence in the heart of a back-three and even got on the scoresheet as he netted in the eighth minute.
And Sevilla showed no mercy after the match as they mocked Greenwood on social media.
The club's English account on X wrote: "Sergio Ramos emptying his back pocket after the game tonight:"
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Then a series of images showed a set of keys, a wallet, an iPhone and then Greenwood.
It is often used as a way to describe a defender 'pocketing' an attacker, stopping them from having any meaningful impact on the match.
And fans were left in stitches by Sevilla's jibe, with one saying: "Shameless and I love it."
Another replied: "OWN!"
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While a third posted: "HAHAHAHAHAHAHAHAHA you deserve a raise.
Greenwood signed on loan at Getafe in the summer from United for the season.
It came after the Red Devils announced that the Englishman would leave after an internal investigation.
The 22-year-old has since made 18 appearances for Getafe in all competitions, scoring five and assisting four.