Meh, I'm 5'8" and have often found myself punching well above my weight class when it comes to women. LOL, and I'm always surprised.

I've also noticed a great many tall women dating/marrying shorter men these days. Used to be a rare sight, now it's commonplace. Hell, I've dated a few women that were 5'10".

The memes are coming from women on dating sites specifying a height of 6'. And yes, that's commonplace. I think it's a reaction to men lying about their height (women lie about their weight), and people I've dated have backed up that idea.