Hi there. I thought I would reply to your post in it's entirety, as a 'handicapped' person and as a person aware of why events like this are good, and not bad.
1) Check the origins of the term handicap - it is derogatory. I'm sure some people will call this OTT or political correctness but whatever. The term 'impairment' is a good choice, mobility impairment, physical impairment. To those reading this who think it is political correctness I will put it in hacker news terms: There are ways of referring to potential customers in a way that ensures nothing you say will stop someone using your service. Anyway, check this out if you are interested in that [1] - it is a history of meaning of commonly used terms used to refer to impaired individuals. I know this was not the main part of your post but I thought I might as well mention it. Disability studies is a growing field and might as well be promoted here.
2) In order for minorities, for instance disabled people, to gain equal rights - in this case equal opportunity of entry into CS fields, it serves the effort well to be a group of people. It brings confidence that you are right, that you must be taken seriously and that attention should be placed on the issue.
For instance. If I am in a wheelchair and I am being forbidden entry to a building because of no ramp, or if I am being mocked and belittled. These are experiences that non-impaired individuals can empathise with, but they have not experienced it. So if I have experienced oppression I want to talk to other people who have, figure out what is necessary to change it and build up a group of people that can symbolise to other impaired individuals that while they may have to put up with the shit they get from other people, it is those people that are wrong.
So, if you take out the oppression part and look at a different social experience it might become more obvious.
Lets say someone in your close family has died. Whenever it comes up with friends or acquaintances who you know haven't experienced it you might be met with pity, sympathy, apologies or whatever. It makes you cringe a bit because people skirt over the topic because they don't know how to deal with it. Then one time you are talking to someone and it comes up that you have lost a close family member and it turns out they have too, and in a very similar way to you. Not only do you instantly feel comfortable talking to this person about this topic because they have experienced it, you also get to discuss how everyone else is ill-equiped to deal with such news mid way through a catchup, or whatever.
What I am saying is that, in a field such as tech, I would not be surprised if women would feel most comfortable relating to women as it is something that defines their experience and they can relate to each other directly. So, having these female founders as proof, as encouragement and as a tool for not just solidarity amongst women in tech but ALL in tech (because think about it: how many non-gender specific founders conferences have been all men, without specified as such).
I think this is a good thing and I think that being indifferent to the problem is really not worth posting about on a forum. Good for you, you want everyone to be treated the same but you don't want to do anything about it. And you feel so strongly about it you decided to post it here (that is aimed at the guy you replied to, not you).
Change does not occur by ignoring difference. It requires being pro-active and the organisers of this conference and the females speaking at it are doing just that.
[1] - http://disability-studies.leeds.ac.uk/files/library/Clark-La...