"No-one forced me to leave, I left of my own free will," he said, adding that Armstrong's sponsors cannot claim to be "victims" either because "they got their money's worth" in publicity.
On the issue of Armstrong's legal problems with the US federal government, Mercier said: "Nearly every rider who donned a USPS kit was involved in some sort of doping, and yet only Lance defrauded the government? All those guys were paid real money."
Armstrong and Mercier are now friends and often ride together when the disgraced Texan visits his holiday home in Colorado.
Armstrong mentioned Mercier in his recent BBC interview as an example of somebody who chose "integrity" over the career in professional cycling.
"I was never much of a Team Lance fan," Mercier explained.
"I knew he was lying and his arrogance and boorish behaviour made me cringe.
"However, my issue with him was never about his performance. He was, quite simply, the best of his generation and is one of the fiercest competitors the world has ever seen.