Princess Kate and Prince William were heckled by a protester as they arrived at The Gothenburg pub in Fallin during their visit to Scotland on Tuesday.
Footage shared online showed an unidentified man shouting twice in a raised voice: "How long have you known about Andrew and Epstein?" as the couple began greeting members of the public outside the community-run venue.
The Prince and Princess of Wales did not respond and continued with their walkabout.
In videos captured on social media, they could be heard introducing themselves while shaking hands with those gathered, with the princess saying: "Very nice to meet you."
The interruption came during a day of engagements in Stirling and Falkirk, focused on community and Scottish heritage.
The Gothenburg, known locally as The Goth, is a rare example of a Scottish pub still run under the Gothenburg system.
Under the model, profits from the pub are directed back into community causes rather than paid out to private owners.
During the visit, the Prince of Wales met the pub’s publican, Rob Donaldson, who took over the establishment in 2013.
Prince William and Princess Kate unfazed as protester shouts about Andrew Mountbatten-Windsor
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Mr Donaldson spoke to Prince William about the value of community-led projects and later presented him with a Guinness glass featuring the Goth logo along with shares in the pub.
Mr Donaldson said: "It’s just made my day. It’s made my year."
He added that his previous high point running the pub had been: "Keeping it alive for the community." He went on: "That’s just topped it by the way, meeting a future king. Absolutely fantastic."
The Princess of Wales also spoke with local people inside the venue and discussed the pressures facing schools.
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Prince William and Princess Kate having a drink in the Gothenburg
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The pub told the couple that around 95 per cent of its profits are donated to community causes, including support for families in need as well as donations to food banks and local charities.
Earlier in the day, Prince William and Princess Kate visited the National Curling Academy at The Peak leisure centre in Stirling to meet Team GB and Paralympic GB curling teams ahead of the Winter Olympic and Paralympic Games in Milano Cortina.
The couple spoke to athletes about their preparations before stepping onto the ice to try curling for themselves.
Bruce Mouat, skip of the men’s curling team and one half of the mixed doubles pairing, said: "It was wonderful, really nice that they came to wish us good luck for the next month we are about to embark on, both of them were lovely and willing to curl."
Despite the lone protester, several fans came out to support Prince William and Princess Kate
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Mr Mouat added: "They said they would be watching the games, which means a lot to us."
The National Curling Academy opened in 2017 to provide year-round access to a dedicated training facility for British Curling athletes.
The University of Stirling said several former sports scholars were among those selected for the Milano Cortina competitions and met the royals during the visit.