A reminder that it's always been this way, the manosphere is just the latest version of it
(piefed.cdn.blahaj.zone)
I see no criticism in the comic at all. Young men of the previous generation wanted the girl on the left, now they want the flapper. It's just a comment on how far and how quickly society was changing 100-years ago.
Also, if the artist were making fun of the flapper they wouldn't have drawn her as so attractive. Maybe it's just me, but she's leaving me hot and bothered. :)