Shadow Europe Minister Pat Glass has apologised after calling a voter a "horrible racist" while on the EU referendum campaign trail.
Ms Glass said the comments, which were made during a BBC Radio Derby interview after an encounter in Derbyshire, were "inappropriate".
The BBC reported that the man Ms Glass was referring to had described a Polish family living in the area as "spongers" because he believed they were living on benefits.
"Concerns about immigration are entirely valid and it's important that politicians engage with them," the Labour North West Durham MP said.
"I apologise to the people living in Sawley for any offence I have caused."
In the interview, Ms Glass is heard saying: "The very first person I come to is a horrible racist. I'm never coming back to wherever this is."
Conservative MP Maggie Throup called on Ms Glass to make "a full apology to my constituent at the earliest opportunity".
During Gordon Brown's 2010 election campaign, a microphone caught him saying a Labour supporter who had challenged him over the economy and immigration was a "bigoted woman".