French fury was sparked after the Government in London announced last month that it had approved just 12 of the 47 applications it had received from French small boats.
The activist group highlighted the establishment of a "VIP lane" to help Tory donors purchase PPE.
“This incompetence risks causing more empty shelves and more misery for British consumers in the run up to Christmas."
In just a few hours, the tweet has received thousands of replies - and none of them are particularly positive about the UK.
Cummings also claimed that Johnson never understood what his Brexit deal with the EU really meant.
“Now we have a joke prime minister and a joke leader of the Labour Party and we obviously need a new political system," Cummings has said.
The couple have backed a campaign for "a childhood free from unwanted harmful exposure to the public glare and the upset caused by paparazzi taking photographs of them,”
The backlog will add to concerns over how UK industry will cope with the key Christmas period.
"Our coastline and beautiful beaches, arguably our most important natural assets, should not have to sustain continued environmental damage."