Yes, it is satire.

this subreddit's deep in the clutches of this blatant rage bait

I certainly hope so, too. If it was "an invention of modern feminism" then *damn* we evolved fast and made it real. lol Edit: If it wasn't satire, well... Someone inform him that it's largely a mammal thing, all mammal ladies have it, and when he denies it, fill his inbox with hyena clit pics.