However, as thick headed and unapologetically thick-skinned I assert myself to be and expect others to be, I can absolutely see why women would have a problem with this in this particular environment.
Let me present a really shoddy analogy (but it's all I've got at the moment):
I am obese. I attend a tech conference full of professionals in my industry. Friends, colleagues, potential connections, people I admire. Someone then comes on stage and does a presentation about fat people. It's an app that focuses on how fat people are. For humor. And they attempt to make a lot of humor about it. And the audience around me is laughing.
Now, I'm super fat. I'm more than aware of that. I know that people around me are, too. I have a good sense of humor. I'm even happy to make myself the ass-end of a joke about my weight. However, when I am in a huge room full of people laughing at a presentation making light of people like me, I suddenly feel incredibly awkward, self-aware, embarrassed, and like I'm not wanted there. Maybe that I don't even belong there. So, I stop going. I stop supporting. I stop participating.
It's all about context and having a little tact. These guys used pretty poor judgement. I don't think they should be strung up or driven out of town for it. They should just be an example of how people with no ill-intentions can end up making other people really uncomfortable and how that is something you need to be sensitive to when acting in any professionally related capacity.