Have you ever argue with a developer who:
+ have the same level as you
+ on the same position in the company
+ in the same team
+ OLDER than you
+ thinks their code is the best

A few years back, a coworker and I argue about how to implement a feature. I proposed an approach. He proposed a different one. I immediately saw some problems and told him. But hell no, he defended his idea so strongly that I just gave up since I will leave the company soon.

2 weeks later, when the sprint was about to end, the whole team had to work overtime to fix the mess because of his terrible approach.