Societal norms were constructed when women outnumbered men - now that's flipped
I find it fascinating that it's not more widely known that for most all of history, at ages 18-40, there were more women than men in pretty much every society due to war, occupational hazards, and child mortality affecting males more than females. Guys simply died a lot. I'm reading Wild Bill Hickman's autobiography during the 1840s and as he was helping the Mormons move west, one thing he said is they need to ensure that there are men available for the women to marry. That shows you what the 'scene' was at the time! The 20th century had huge craters in the male population from conflict.
Today, it's flipped, men outnumber women - the sex ratio at birth is 1.05 males : 1 female (and higher in some countries). So 5 guys out of 105 don't have a female counterpart. That is fundamentally going to shift dating, gender norms, careers... EVERYTHING when it comes to how people behave.
Young people aren't weird and atypical, they are subconsciously adjusting to the reality on the ground for relationships and behaving while being stuck in a society that still clings to quite a few norms from 100 years ago.
Edit: here's a couple sources