Ugh... the reactions to these idiotic, misogynistic statements always feel overblown. Yes, sexism is a pretty big problem in the industry (and adjacent ones). But you're not going to fix it by griping about a horny 20-something saying something stupid about women (surprise!). You're not even going to help. You're just going to walk away with a "there I helped" endorphin rush and go back to not really caring for the vast majority of your life.
The response to funkah's "garden-variety moron" objection has brought out the excuse of, "well, this was an official flier, so it's a big deal". IMO, the fact that this happened on something "official" is less an indication of rampant misogyny (not that I'm denying it exists!), and more an indication of our ridiculously informal, fast-and-loose culture. (The poor quality of the rest of the flier bears this interpretation out.) So what it comes down to is, someone decided to turn a massive brain-fart into an "official" flier, and part of that brain fart was a stupid, misogynistic comment. Surprise, surprise.
I'm sure everybody's real proud that they've managed to detect and criticize blatant, overbearing misogyny, but I don't see many submissions focusing on the persistent discouragement of young girls from participating in science - a very real, and ultimately more fundamental problem. Lets have some. And lets give them more attention than this "moronic person is moronic" stuff.