The music veteran - who produced the singer's breakthrough 'Off The Wall' album and 'Thriller', the biggest selling album of all time with the star - says Michael sacked him because Quincy loved rap and the star thought the genre was dead.
He laughed: "Michael fired me. He said, 'Quincy doesn't understand the business any more. He doesn't know that rap is dead'."
However the 77-year-old doesn't hold any grudges.
He said: "But it's OK. It wasn't so obvious then."
Quincy also revealed he thinks rappers could "revolutionise" education.
Referring to tragic Columbine high school massacre, he added: "Everywhere in the world, rappers have kids in the palm of their hand.
"I put together a curriculum so schools know who rappers are - so kids don't have to pretend to be Columbine neo-Nazis saying 'Yo homie!' on the internet."
Quincy also admitted he would love a position in Barack Obama's administration to make his rap curriculum dream happen.
He said: "We're the only county with no minister of culture."