The comments infuriated Mr Gallois who took to Twitter to lambast the MEP.
He wrote: “Eurofanatics have still not supported the #BrexitFlag of United Kingdom.
“We can hardly be more hateful.
“He looks like the little kid who hasn’t done his homework and is trying to cheat.”
In a bitter attack on the UK, Mr Canfin wrote: “I’m convinced. The British are at the end of the benefits of their strategy of vaccine nationalism.
“They played the stowaways.
“They signed a contract with AstraZeneca which explicitly excludes all deliveries of doses to the EU. And, at the same time, another with Pfizer / BioNtech which implied that the doses injected into the UK come from Europe.
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The row between the UK and the EU began when Commission President Ursula von der Leyen threatened Britain with a ban on vaccine exports last month.
Responding to the latest confrontation coming from Brussels, Health Secretary Matt Hancock said: “Well it would be easier if we just allowed people to deliver jabs to fulfil their contracts, which is how things ought to operate.
“I think the best thing would be if we could all work together.
“We’ve worked so hard to get this vaccination programme working so fast in the UK.
“We’ve supported the setting up of these production sites in the EU as well as here, and we’ve put a lot of British taxpayers’ cash into getting this vaccine going.
“When you have a contract for the delivery of vaccines, I think that should be fulfilled.
“But also we took the decision really early on to make sure we also produce it here at home in case we have this sort of problem. So thankfully, the vast majority of the Oxford jab is made here at home.”