Ji Changsheng wasn't hubristic nor did he become agitated. Facing the Human's Emperor's invitation, he calmly blurted out, "Are you drunk?"
Ambition is ambition, but objective reality is objective reality.
Plans must be actionable for Ji Changsheng to cooperate.
In Ji Changsheng's view, the Human's Emperor's plan had no chance of success.
As for Ji Changsheng's reaction, the Human's Emperor was somewhat surprised.
"What does Great Emperor Changsheng think the problem is?"
Ji Changsheng complained, "Everything is a problem."
Li Changxi added insult to injury, "The biggest problem is that God Hao Tian simply can't be killed. It's one thing to play around, but you can't seriously joke about God Hao Tian. In the Heavenly Court, God Hao Tian's strength is about the same as Empress Hou Tu's in the Underworld, and it's not an exaggeration to say he's on par with Saints."
This Heavenly Emperor was indeed very powerful.