"How laughable is the condition 'consume no liquor' to make Bhagwant the convener? How can they have a condition 'don't drink now', because that itself acknowledges that he is a drunkard," said Mr Singh, who walked out of the party on Wednesday. He followed it up with a further revelation: "Bhagwant himself said 'remove me if I drink again'".
AAP, which is fighting battles on multiple fronts - the biggest being the corruption charges against party chief and Delhi Chief Minister Arvind Kejriwal - had maintained silence on reports of the no-drinking rider for Mr Mann.
The drinking habits of Mr Mann, a parliamentarian, had drawn complaints from his colleagues in the house. There have been allegations that he turned up drunk at the party's campaigns in the run-up to the assembly elections in Punjab. And it became a matter of ridicule after Prime Minister Narendra Modi made a jibe at him in Parliament.
Mr Mann was not amused and threatened to report the Prime Minister for breach of privilege.
This time too, Mr Singh's jibe provoked Mr Mann to retaliate. Mr Singh, he said, was made the party's state convener within two months of joining. "At that time, the selection process was right? Now he raises question about it.... I did not expect him to raise questions about the selection process when the party has given him so much," Mr Mann said late last evening.