How to deal with a team mate with an inflated Ego?

I have an engineer on my team who thinks his way is the only correct way. He unnecessarily optimizes his code(For example, he uses methods with multiple params instead of passing the whole object), and adds an extra layer of validation even though the current validation works perfectly fine. He doesn't like if people comment on his PRs and complains that he is blocked by the comments. And the worst thing is, he isn't willing to change his code even if you justify your comments or explain the problems in detail.

I'm fed up with this, I gave up multiple times out of frustration. And the technical owner of my team also doesn't want to argue with him. Being a senior engineer in my team, I'm not sure how to deal with this situation.