What do you mean? Are you asking why he hates the MC?
If yes, it's because MC/Tang Wei has replaced the soul of his actual child. In a way, the MC/Tang Wei killed his real kid.
And also a whole lot of other reasons, including his wife's death and having to sacrifice part of his soul (and getting permanently stuck in Xiantian because of it) to enable MC to live as a normal person instead of a literal slave of the Heavens.
So yeah, I don't begrudge Chao for the hate, although he's taking off his anger on someone who is innocent at the end of the day. Uncle Tao though is just a D1 Hater, he wouldn't like MC even if their Aunt was alive.