Every way has its pros and cons. Having an age related hierarchy might have benefits like societal coherence or stability. I am not a proponent of it, I just acknowledge my inability to fully grasp the impact and ramifications as to label one as superior and the other as "perverted".
Hierarchies invite revolt and need a lot of force to keep in place.
If you think there are no hierarchies everywhere, then we have a completely different worldview.
Acknowledging downsides of some culture doesn't automatically mean cultural superiority bias.
Calling out actual negative effects of a culture has nothing to do with claiming some culture is more superior. He's literally just pointing out specific outcomes. Is the birth rate in Korea a figure of my imagination based on my cultural superiority bias or a product of some of the negative effects of their culture?
Just saying "superiority bias" is completely sidestepping an actual discussion to be had about actual problems.
The situation looks exactly the opposite if you look at the birth rate in the Korea.
Influenced by Confucian culture, China doesn't have such a perverted etiquette system at all.