I think we're underestimating how relatively recent these social phenomena are. Just a few decades ago, the average person had very limited exposure to people

I think we're underestimating how relatively recent these social phenomena are. Just a few decades ago, the average person had very limited exposure to people outside of their immediate town (outside of celebrities and public figures), which really grounds your standards and expectations of other people. Spend 5 minutes in any social media or dating app today and average people around you will start to look severely below average. There was also stronger cultural pressure to settle down by a certain age, which again, forces you to be more realistic with your options. The tldr is that Our Paleolithic biology has only so much capacity to adapt to today’s rapidly changing culture and environment.