Literally no one has said that. Read the comments. Even the author of the post isn't condoning it.
On the other hand, if a guy did this, you'd laugh or write it off. When a girl does it, she's a fucking hoebag.
How about "Wow, what a dumb girl. That wasn't even really all that funny. Huh." There, no more sexism. Your analysis of the situation isn't any more valuable than a chimp scratching its butt hole and smelling the finger.
Edit: Sorry for the outburst, but the treatment of women is a very sensitive issue for me.