Prince Harry appeared to wipe his nose on his shirt in front of Meghan Markle in a cringeworthy video.
Last Friday in Santa Barbara, Nacho Figueras, 47, competed in the Royal Salute Polo Challenge against the Duke of Sussex.
The annual event raises money for Sentebale, a foundation that Prince Harry and Prince Seeiso of Lesotho founded in 2006 to help underprivileged children.
Following the Sentebale team's triumph, Figueras applauded Prince Harry on Instagram, praising his "commitment to making a difference" as "truly inspiring".
Their respective wives accompanied Figueras and Harry at the polo tournament, Delfina Blaquier and Meghan Markle.
The Duchess of Sussex, 42, handed the Duke of Sussex his trophy, before embracing her husband in a passionate kiss.
Prince Harry, 39, could then be seen touching his nose before appearing to wipe his hand on his shirt.
One X user wrote: "That nose rubbing/wiping it on your hand is so gross."
Another wrote: "That is disgusting!"
In addition, someone said: "There are camera crews everywhere, ask for a tissue man!"
Similarly, one social media user commented: "Wiping your nose like that is awful!"
Having first met Prince Harry in 2007, Figueras has said he hopes Prince Archie and Princess Lilibet will continue their father's love of polo.
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When asked if he'd like Harry's children to play against his own, Figueras said: "I really hope so, I hope that Archie and Lilibet get to love horses as much as he does.
"I know my kids love it and they love to play. It would be a dream that one day we all get to play polo together."
Continuing to speak to Hello!, Figueras disclosed his intimate friendship with Prince Harry, stating that they "speak very often".
