They claim, despite wanting to Remain part of Britain, Brexit will make it a “struggle” for them to live their lives on the Rock.
Ninety-six per cent of the overseas territory’s residents voted to remain in the bloc, as well as previously expressing their desire to stay part of the UK in two separate votes in 1967 and 2002.
However, the EU referendum has seen a wave of negative feedback from locals concerned about their future.
One said: “Thirty thousand Gibraltarians could vote for the referendum and 96 per cent of us chose to stay in the EU.
The Rock's residents have launched an angry Brexit backlash
if they close the border, living here will become a struggle
“That’s an incredibly strong message.
"Politicians have no idea about our lives here, or about how we live here – they really shouldn’t decide our future.”
New Schengen security measures have seen vast queues building up at the Gibraltar-Spain border as stringent document checks are carried out.
This has sparked concerns that the Rock could come to a daily standstill as commuters are faced by huge delays while travelling across the border, if the border is not allowed to maintain membership of the EU’s free travel zone.
Another added: “Everyday over 16,000 Spanish people come here to work.
“A big problem will be how the Spanish will keep working here – the economy is going to go down, it’s not good for Gibraltar to leave the EU.”
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Huge border queues have built up after stricter security checks
A third said: “It will be the same, or even worse, than when the border was closed – that lasted 13 years.
“Campo de Gibraltar turned into a ghost town – if they close the border, living here will become a struggle.”
Spain were accused of using Brexit to make a “land grab” for Gibraltar under official guidelines drawn up by the EU.
European Council documents launched by president Donald Tusk suggested Spain will be given an effective veto on whether the Brexit deal applies to Gibraltar.
The draft guidelines composed by EU leaders claim the Brexit deal will not apply to the Rock without an “agreement between the kingdom of Spain and the UK”.
Things you may not know about Gibraltar Mon, April 3, 2017
Gibraltar is a confusing place, especially if you have never been yourself
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Gibraltar has its own political system that makes many decisions within the territory but issues like defence and foreign affairs are determined by the UK Government in London
Theresa May retaliated, claiming she would never put the people of Gibraltar under the sovereignty of another state “against their wishes”.
She told the House of Commons: “We are absolutely steadfast in our support of Gibraltar, its people and its economy. Our position has not changed.
“We have been firm in our commitment never to enter arrangements under which the people of Gibraltar would pass under the sovereignty of another state against their wishes, nor to enter into a process of sovereignty negotiations which Gibraltar is not content.
“The letter is a notification in relation to our withdrawing from the European Union, Gibraltar is not a separate member of the EU, nor is it a part of the UK for the purposes of EU law, but we are clear that it is covered by our exit negotiations.
“We have committed to involving Gibraltar fully in the work that we are doing.”