Tory MP Michael Fabricant described Mr Shapps as "embittered", while colleague Vicky Ford dismissed the Welwyn Hatfield MP as "completely out of touch", revealing "he's not even in our WhatsApp group".
After Mr Shapps was named by the Times as the leader of a group of around 30 Tory MPs planning to send a delegation to Mrs May to tell her she must go, he accused the party whips of leaking his name in an attempt to "smoke out" the rebels.
With his local grammar school education and a rock star relative who played guitar for The Clash, Mr Shapps has a slightly different background from his contemporaries at the top of the Conservative Party.
Mr Shapps told the BBC's Today programme: "I'm slightly surprised that the whips briefed the newspapers about it.
The final straw for Mr Shapps appears to have been the emergence of an email sent to him by exminister Baroness Warsi in January, complaining that the election campaign aide had been abusing her on Twitter.
The final straw for Mr Shapps appears to have been the emergence of an email sent to him by ex-minister Baroness Warsi in January, complaining that the election campaign aide had been abusing her on Twitter.
Shapps finally quit as international development minister after it emerged he had received a complaint against Clarke by former minister Baroness Warsi in January, but failed to take action.
Shapps resigned as Minister of State for International Development amid accusations he had failed to act on complaints against shamed Tory activist Mark Clarke.
The buck should stop with me," Mr Shapps wrote in his letter to the PM.
Over the past few weeks -- as individual allegations have come to light -- I have come to the conclusion that the buck should stop with me," Shapps said in his resignation letter to Cameron.
Grant Shapps said: Removing foreign national offenders is a key priority for the British Government and the agreement I have signed this morning plays an important role in supporting this from now on.
Shapps argues that a yearning for Europe is depriving Africa of its most capable citizens -- the young and mobile -- and that new forms of assistance are needed to stem the exodus.