Independent presidential candidate Catherine Connolly was confronted by teacher Enoch Burke while she was canvassing in Limerick this afternoon.
It happened as Ms Connolly addressed a demonstration in support of Palestine and Gaza at Bedford Row in the city. It lasted around two minutes.
Footage circulating on social media shows Mr Burke approaching Ms Connolly and he was critical of her views on gender identity.
The crowd surrounding them chanted "shame, shame, shame".
A spokeswoman for Ms Connolly's campaign declined to comment when contacted by RTÉ News.
It comes as both candidates met with members of the public one week out from polling day.
Ms Connolly also met traders and shoppers at the Milk Market in the city centre before continuing her canvass at the Crescent Shopping Centre.
Among the politicians accompanying her were TDs Maurice Quinlivan of Sinn Féin and Conor Sheehan of the Labour Party. Former Labour TD Jan O'Sullivan and local councillors from Sinn Féin, the Social Democrats and the Labour Party are also participating.
She also travelled to Co Clare for canvasses of Miltown Malbay, Spanish Point and Ennis.
Meanwhile, Fine Gael presidential candidate Heather Humphreys met with voters at Blanchardstown Shopping Centre where she was joined by other Fine Gael politicians including MEP Regina Doherty and former TD Paul Kehoe.
Businessman and former presidential candidate Seán Gallagher met Ms Humphreys at the shopping centre where he endorsed her for president.
Speaking to RTÉ News, he said he wants to call on his friends in Fianna Fáil and Micheál Martin to come out and support Ms Humphreys "who shares the same values and policies that are aligned with Fianna Fáil".
"I think it's important now that they come out, the members and supporters this last week and give Heather full support.
"I think elections matter, and I think elections have consequences, and none more so than Ireland's reputation. And I think it takes decades to build a reputation, but only minutes to destroy one."
He said Ms Humphreys will represent Ireland at home and abroad with great distinction.
On the campaign trail in Blanchardstown, Ms Humphreys faced questions about the hot school meals scheme as she met undecided voters, who she told she would not let down.
Speaking to the media she said she wanted to thank Mr Gallagher for his support.
"I've met many people here today, and they're saying to me, Heather, you know, you're an ordinary person like us. You're a middle of the road person, you're not the far right, you're not the far left, you're centre ground.
"And you know, we're voting for you because we want common sense and we want an ordinary person," she said.
When asked about today's Irish Times/Ipsos B&A poll indicating combined support for Fine Gael and Fianna Fáil is at an historic low, she said there is only one poll next Friday, "and that's exactly the one that I'm focused on".
Ms Humphreys said that she has been to Dublin a lot because she has been doing a lot of media and debates.
"I am going tomorrow to Roscommon, and I'm going to Sligo, so I'm getting into the West tomorrow," she said.
"There's a good few days to go yet, and I can assure you, I'm full of energy," she added.
Ms Humphreys also visited a second shopping centre this afternoon, meeting voters at Swords Pavilions Shopping Centre.
There, she bought a raffle ticket for St Francis Hospice in north Dublin as she made her way through the vicinity.
She was greeted by rugby fans at Croke Park before the Leinster and Munster game.
Tánaiste and Fine Gael leader Simon Harris, who was out canvassing with Ms Humphreys, called on "middle Ireland" supporters of Fianna Fáil, Labour and Independents to "lend" his party's presidential candidate their vote in Friday's Presidential Election.
The Tánaiste said he wanted to reach out to non-supporters of Fine Gael and encourage them to vote for Ms Humphreys next week.
"We know you might come from a different political tradition, and that's okay because the presidency is above party politics, and I hope when Fianna Fáil voters or Labour or Independents look at the ballot they'll recognise that Heather is the candidate that most closely reflects their views," he said.
