Mr Cameron is said to have made the joke during an after-dinner speech during a Conservative ‘away day’.
The joke centred around a man who moves to Lincolnshire and finds himself lonely until he is visited by a farmer and invited to a party, which will likely end in rough sex between the pair.
Following reports of the joke in national press, the former General Election Green party candidate Victoria Percival questioned whether Mr Warman supported the joke.
She wrote on his Facebook wall: “Did you find a ‘joke’ calling Lincolnshire farmers drunken, violent and sexual predators funny?”
Mr Warman described the whole affair as ‘a storm in a teacup’ an pointed out it was a historical quip,
He also accused people of manufacturing outrage about the joke.
He posted: “Do I find stereotypical, out of date jokes amusing? The correct answer is evidently no. Was this one of those? In context, not really. Is this a storm in a teacup that some people want to pretend fulfils all their preconceptions about one political party? I would say yes.”
However, others also reacted negatively to the joke on the post on Mr Warman’s Facebook page.
Natasha Marchant wrote: “I can’t speak for Victoria here, but I suspect you’re right - there is plenty to be outraged about this government. I think the inappropriate joke just serves to underscore the complete and utter contempt this government holds the general public in. It’s representative of the general lack of respect.”
Bec Fawcett-Howitt added: “Mr Warman, the joke is offensive. Regardless of who used it first or its frequency of use, it is offensive. You wouldn’t tell a joke about race or religion because they are offensive.
“This is not an acceptable joke to utter.
“You must understand that.”