A senior Congress leader, who gave the sobriquet to the SP supremo, objected to the way Yadav went about at a meeting called by the Lok Sabha Speaker on the Parliament logjam.
'Khudai Khidmatgar' literally means "servant of god" but if used sarcastically, it implies criticism that the person is more loyal than the king himself.
The SP chief did not talk to any Congress leader beforehand on the Parliament logjam, the leader claimed.
Another Congress leader said Yadav's action was aimed at helping the ruling BJP and its floor managers, and it should be seen as an "act of compulsion" amid CBI investigation into the Yadav Singh case in Noida.
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An opposition leader said the SP supremo is known for changing his positions. In the last presidential elections, he teamed up with Trinamool Congress chief Mamata Banerjee, but changed his position soon after.
At a meeting convened by Lok Sabha Speaker Sumitra Mahajan, SP chief Mulayam Singh Yadav told Congress leaders to spell out their demand for breaking the logjam in the House, allow the minister concerned and the government to answer their allegations and end the matter through debate.
Adopting an aggressive stand on the continued logjam, Yadav said the deadlock should be broken and those making allegations and those against whom charges are made have a right to speak in Parliament and explain their position before the people of the country and the disruption should end.