User blog comment:B214/Question and Answers/@comment-166.216.194.168-20131021004417/@comment-16281343-20131021005301

They do not hate each other.

Maybe what you are referring to is the incident where Azazel was defeated by Cao Cao.

Vali was enraged because he saw his adopted father taken down.

But in regards to their relationship with each other, there is not much hate between them.