The 40-year-old was elected the MP for St Austell and Newquay in 2010 with a slim majority of 1,312 but lost the seat to the Conservatives at the 2015 general election.
He is now standing for the Lib Dems in the Cornish constituency.
But it appears Mr Gilbert has signed his own political death warrant after it was revealed he called those who voted to leave the European Union (EU) “f***wits” in a rant on the social networking site.
Stephen Gilbert has dubbed Brexiteers as 'f**kwits'
Mr Gilbert posted a picture of an EU flag with one of the stars as a tear, below which he wrote: “F***wits the lot of ‘em. From Great Britain to irrelevant England in 24 hours. Now, how do you claim refugee status??”
The situation only gets worse for Mr Gilbert as the area he represented voted 64 per cent to leave the EU during the Brexit referendum.
Mr Gilbert has spent the last two years training as a schoolteacher at Penrice Academy but wanted to stand to oppose what he saw as an “economically disastrous hard Brexit”.
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The comments have caused outrage amongst Brexit supporters.
Jayne Adye, the Director of cross-party Eurosceptic group Get Britain Out told Express.co.uk: “How on earth can any prospective parliamentary candidate be so out of touch with the voters in the constituency he hopes to succeed in?
"But this is typical of the Liberal Democrats – particularly in this election – trying anything to gain a few votes without thinking of the repercussions.
“By clearly insulting Brexit voters in this staunchly ‘Leave’ constituency, is the former LibDem MP, Stephen Gilbert, likely to gain any of those Leave votes, or any others in fact?!”
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Stephen Gilbert's Facebook post about Brexit
Ukip MEP Bill Etheridge said: "As the former MP for this seat if he holds his previous constituents in such abject contempt then it is no surprise that he voted them out in 2015.
"With just eight days to go until Election Day; I hope all Brexiteers in St Austell let him know just what they think of the man by using their votes to show him. Let's not forget he called ‘f***wits' which is hardly respectful, decent, gentlemanly or befitting of a Member of Parliament.
"The people voted for Brexit: That means out of the single market and no uncontrolled immigration and Theresa May needs UKIP as the guardians of Brexit to make sure she doesn't backslide."
F**wits the lot of ‘em. From Great Britain to irrelevant England in 24 hours. Now, how do you claim refugee status??
Liberal Democrat candidate Stephen Gilbert on Brexit voters
Mr Gilbert told the local newspaper, St Austell Voice, recently: “I want to be clear, I voted remain and believe that Britain is stronger in Europe, but I respect the referendum result.
“What I don’t respect is our current MP who has consistently voted to put his party’s interests ahead of the interests of our farmers, fishermen and the interests of our vital tourist industry.
“We need an MP who is capable of standing up for Cornwall, but what we have is a weak Tory ‘yes man’.”
Liberal Democrat Stephen Gilbert has called Brexit voters 'f**kwits'
He added: “Any final Brexit deal needs to be put to the British people because there is just too much at stake to give May a blank cheque and then just stand back and trust politicians in Westminster to look out for the people of St Austell and Newquay, 250 miles away.
“We may have voted for departure but we didn’t vote to have no say at all about what that departure would be like. These are the people who brought us the lie about £350m a week for the NHS.”
The London School of Economics graduate started his political career as a borough councillor and briefly worked in the Westminster office of the then Lib Dem MP Lembit Opik.
Stephen Gilbert, the Liberal Democrat hopeful for St Austell doesn't like Brexit voters
Mr Gilbert stood by his Facebook coments, saying: "Frankly, I've yet to come up with a better name for the architects of the Out campaign, Michael Gove, Boris Johnson and Nigel Farage.
"I want the people of St Austell & Newquay to have the final say on the Brexit deal. This process started with the people and it should end with the people and sadly Theresa May continues to demonstrate why she cannot be trusted to do it alone."