The American, victor of four Olympic and eight world titles before retiring from the sport in 2000, was also involved in a lengthy debate with fellow athlete Steve Cram, now the lead commentator on BBC Television.
The America shocked Usain Bolt and Christian Coleman to win Saturday's blue riband event but didn't receive the usual adoration for his success.
During the victory ceremony yesterday, held just before the afternoon session, Gatlin was booed a again by the crowd.
The controversial American upset the odds to win the race in a time of 9.92 seconds, edging his compatriot Christian Coleman into second and Bolt into third. Johnson wrote on Twitter today. Johnson said during a discussion broadcast on the BBC. Dutch sprinter Dafne Schippers, the 2015 World Championship Silver Medalist in the event, added the bronze medal to her resume with a time of 10.96.
"Because how is it that Justin Gatlin stands out so far above in your mind and other people's mind above all the other drug cheats?" American sprint legend Michael Johnson said that Bolt's legacy has not been tarnished despite the result.
"I've only ever tried to deal in facts." he said.
Willie said Justin had been fully rehabilitated in the U.S. and that he could be a role model for children.
The American sprinter has been caught doping twice in his career, serving a total ban of five years.
Johnson responded by claiming the athletics world has done "a poor job of educating because we created a story that was not accurate".
The return of Justin Gatlin to top-level athletics removes the incentives for his fellow competitors to stay drug-free, says a former director of ethics and anti-doping at UK Sport.
And Gatlin knew what Bolt meant to the sport, bowing in admiration in front of him, even after beating him.