It's not about women at all.
sighIn an already male-biased community the non-inclusivity of demos like these put out a very specific message to women: this is not for you.
The tit staring demo puts out a worse message: this is not for you—you are just a sex object to us.
If you were a female hacker how would that make you feel your work will be judged by your male peers?
Turn it around in your head, if you can, to a position where all industry and powerful roles are controlled by women and an important industry is dominated by women. It holds a conference where there are demonstrations of things that are women-only and where a man's role is reduced to that of sex object. Add to that a lot of cliquey female sex jokes where men are often the but but you are expected to laugh along and shrug it off. Is that a conference you would want to attend? What if you felt you had to to further your career?
If that doesn't work turn it around to Jocks vs Geeks. Imagine you had to go to a Jock conference to further your career. Where the demos were all about football and the jokes were about weedy geeky types. Now imagine that you had to go to conferences like this if you wanted to further your career and you had to put up with an undercurrent of secret sexuality where jocks joked about having sex with geeky boys and demonstrated technology to spy on their genitalia. Even if I was gay I'm sure I'd find that intimidating.
The world of tech needs to move away from this stupidity and be at the forefront of gender equality like it is at the forefront of a lot of new thinking.
Technology can only bring about a better world if the people who create it understand what a better world looks like.