The link is to a sub where they make fun of incels -- I think.

I looked into this a little bit, and the guy in question has an explanation, that he had known his ex-gf for 8 years, but they hadn't dated that long and only slept together when she was legal. However, that isn't what he wrote before a frame of reference was established for her age.

Also, that's still pretty disgusting. That would be like me dating one of my niece's friends who I knew as children.