Eggman in Sonic X was basically the predecessor to Eggman in Sonic Boom.
In one episode early on he builds a robot to teach all the kids to love him, but the robot decides naturally, that he'll teach all the kids to love him instead.
So Eggman goes to kill his robot for betraying him like that, but the robot gets all scared and starts following Eggman's orders again, and the two of them start teaching the children to love him... By making them all draw portraits of Eggman. Eventually Sonic shows up and destroys the teacher robot, but Eggman doesn't give a shit. He decides to rewards Sonic by giving him an Eggman sticker, but when Sonic rejects it, he tries to give it to the kids, who also refuse to take it. So in the end Eggman decides to wear it himself, and then he flies away completely casually.
And this is only 6 episodes into the show, when Eggman was the primary (and only) threat. It's really kind of bizarre.Sonic was a fucking chump, turning down a free, kickass sticker like that.