The man, named Kevin, dropped an expletive while scolding the floundering leader during a phone-in debate with Nigel Farage on Thursday.
Even his closest ally, Shadow Home Secretary, Diane Abbott, abstained from the vote claiming she had a “migraine”.
The LBC caller dropped an expletive during Nigel Farage's phone-in
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I think it's pretty obvious that he couldn't organise a p***-up in a brewery
Asked whether or not he thought the MP for Islington North was a good leader, Kevin was not shy in expressing his true opinion.
“I think it's pretty obvious that he couldn't organise a p***-up in a brewery very well,” he blasted on the pre-watershed radio show.
“When even his ex-girlfriend Diane Abbott had to pull the sicky – I just sort of I doubt it."
Mr Farage later apologised for the "fruity" language
Undeterred by the “fruity” language, Mr Farage offered Ms Abbot the chance to defend herself on the programme.
“Whatever happens with the Labour Party. Diane Abbott is not emerging well out of all of this.
“Diane call-in because people are really saying nasty things about you,” the former Ukip leader said.
Diane Abbott did not vote in Wednesday's Article 50 Bill due to a "migraine"
As the conversation continued, the LBC caller offered to elaborate on his scathing assessment of the Labour Party – claiming the “rot set in long before Corbyn was elected”.
“I think it was almost entirely down to the large scale immigration that was started under Blair and long since abandoning the purpose they were set up for, which is to protect the working class and now they are insisting on pursuing their own liberal globalist ideologies like large-scale immigration and it doesn't benefit the most vulnerable in society."
Jeremy Corbyn in pictures Tue, July 12, 2016
Labour Leader Jeremy Corbyn takes part in a community meeting at the Guru Har Rai Gurdwara Sahib temple
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Britain's opposition Labour Party leader Jeremy Corbyn speaks at an anti-racism rally in London
Mr Farage responded: “I think Kevin that's a very strong point and I have to say that Diane Abbott perhaps is the one figure on that Labour front bench that causes more offence to Old Labour on this issue than anybody else.”
“She’s still on the line that if you're talking about this issue then basically you're racist and you're stupid.”
The Ukip MEP ended the call thanking Kevin for taking part, “even if the language was a little bit fruity for before the watershed”.
Paul Nuttall is favourite to win the Stoke by-election, according to polls
Labour was dealt another blow on Thursday after a new poll suggested Ukip were on course to win the Stoke by-election.
Data from Leave.EU suggested Ukip’s leader Paul Nutgall is set to beat his opponent Gareth Snell with a six-point lead.
The seat came up for grabs following the resignation of Labour MP, Tristram Hunt.
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