From what I've seen of him I would say that he's more performatively contrarian and plain fucking ignorant than genuinely hateful, or at least started out that way. That's categorically NOT an excuse for his actions and ignorance is often the gateway drug to genuinely taking to heart shitty worldviews.

But I think it's more that - at least initially - Kyrie fancied himself as being deeper than he really is - like the kind of person who knows there's more to life than being a pro ball player but completely lacks the critical thinking ability to accurately figure out what that should be.