The 35-year-old Gatlin, who has served two suspensions for doping offences, ruined retiring Usain Bolt's fairytale farewell yesterday by beating the Jamaican sprint superstar in a highly anticipated 100m dash final.
Bolt, who is expected to be a part of Jamaican title defence in men's 4x100m relay on August 12, came third, behind Gatlin and another American Christian Coleman.
Today, during the victory ceremony held just before the afternoon session, Gatlin was booed again by the crowd.
When bronze winner Bolt's name was announced, the crowd responded with loud cheers. But as soon as the announcer in French began took Gatlin's name, the crowd booed him. It was not a prolonged boo though as some sections of the crowd began to clap in acknowledgement of Gatlin's victory.
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He called up Bolt and silver winner American compatriot Christain Coleman on the top podium to pose together for the shutterbugs.
Interestingly, IAAF President Coe gave away the medals to Gatlin, Coleman and Bolt as it is customary for the global body chief to do the honours of the blue-riband event of the championships.
Coe shook hands with Gatlin before honouring the newly- crowned champion with the gold medal, just as he did with Coleman and Bolt.
Just a few hours back, Coe had said that Gatlin should have been handed a lengthier eight-year ban for his second dope offence in 2006 and that could have ended his career.
Gatlin received a two-year ban in 2001 after failing a dope test for amphetamines found in prescribed medication he had been taking since a child for Attention Deficit Disorder. This suspension was later reduced to one year on appeal.
The sprinter then tested positive for testosterone in 2006 and was suspended for eight years, avoiding a lifetime ban in exchange for his cooperation with the doping authorities.
"I would like (to see lifetime bans) and so would the majority of our sport. I'm not going to close the door on lifetime bans but we've constantly tried it and lost it," Coe, himself a double Olympic gold medallist in 1500m race, said.
Talking about Bolt not being able to defend 100m gold in his final individual race, Coe said, "I'm not eulogistic that someone who has served two bans has walked off with one of our glittering prizes. But he is eligible to be here."
"It's not the perfect script. I thought Usain was very generous with the observations he made. That must have been a bitter event for him to swallow. He was bigger than the moment and it typifies his career," the Briton said, referring to Gatlin's claim that Bolt himself told him that he did not deserved to be booed.
"Gatlin is eligible to compete. It's not the most exciting day in prospect for me (to give away the gold mefal to Gatlin) but he has to be accorded some respect," said Coe.