From my (cis white mid-30s) male perspective, if this winds up being true then it will be because they choose to be single
They will lament that they cannot find any good men, but they will be overlooking "good enough" men in thier lives, I guarantee
I see this with all of my wife's friends all the time. They are all single and they have insane expectations for what they want out of a man
It's a mix of funny and sad because they often will tell her how she's lucky to have found such a great guy, but I wouldn't check even half of their dating requirements
And of course men have high standards too. But despite how gender norms have changed, it remains the case that men pursue women and women choose who they date. So it's on men to meet women's standards but also on women to have realistic, reasonable standards. I see women with unreasonable standards all the time.