The left-winger took the centrist president, who turns 40 in December and is France’s youngest leader since Napoleon, to task over his first few months in charge.
Mr Vallaud told radio Europe 1: “The president is disrespectful towards members of the opposition.
“Mr Macron portrays himself as a modern leader, but a modern leader does not rip apart his country’s political history and deliberately shake the fabric of national politics.
“A modern leader does not replace his country’s traditional party-based system with a clan-based system.
“One can be young and embody rancid political ideals.”
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The Socialist party won just 29 seats in June’s parliamentary election – it’s worst parliamentary score in modern history. Mr Macron’s start-up party, however, took 350 seats out of the 577 up for grabs in the lower house of parliament.
Mr Vallaud also commented on the nuclear threat from North Korea, after it was confirmed on Sunday morning Pyongyang had conducted its sixth and most powerful nuclear test, sending shock waves across the globe.
He said: “The nuclear test is incredibly destabilising for national security, and has the power to destabilise an already unstable world.
“France must condemn the nuclear test in the strongest words… The US and its allies must quickly engage North Korea in dialogue.”
The United Nations Security Council was set to meet on Monday to discuss new sanctions against the isolated regime after activity around missile launch sites suggested Pyongyang planned more missile tests.