A subtext that you may have missed is that it's very awkward and uncomfortable to have only one party to a conversation think that the conversation is sexually charged, and the possibility of that happening is a disincentive to circulating and socializing.
I thought it was a pretty straightforward observation, but hopefully my summary helps you. Translating basic human experience to nerd-ese --- all part of the service we provide!
However, my argument was that if the situations were reversed, the outcome would be exactly the same. Go to a place where there are predominantly women (any dance class or even a Yoga class, feminist conference), and if you and I would try to "talk to them like we talk to men", many of them would assume that we're flirting with them. Or do my observations not concur with yours?
Second, I think your response deliberately discards context. If socializing at "dance class" made women think I was flirting with them, and I was thus disincentivized from going to dance class, I'd... what, be a poorer dancer? Britta's story is about a career problem, not a "not fitting into dance class" problem.
Finally, I think your response totally misses the point. You do not win any kind of rhetorical award for coming up with some kind of table-turning scenario about "feminist conferences", because those scenarios don't have anything whatsoever to do with Britta's experience. She wasn't trying to score points. She was explaining why a piece of standard advice given to people about making connections in their profession is difficult for women.
I am also more serious when I'm talking to people I don't know - less smiling, more matter-of-fact, cool instead of warm. This is artificial for me since I'm generally friendly, but apparently it's less confusing.
I spend a lot more time reading the situation to get a better feel for how people are likely to respond, including whether people at the conference/event are likely to already have a reasonable amount of experience working/talking with women as peers.
Or I find ways to meet new people while I'm with other people, such as joining groups that have positioned themselves to be open to others joining in. Or convincing friends - or people I've just met - to tag along with me to meet other people.
That looked like a fun skill to have, so I tried doing it on my own - introducing myself to other attendees, asking about their work and projects, etc. And I ran into a bunch of awkward situations where the person responded as if I were flirting with them (inevitably most of the people I talked to were men, since most of the people at those conferences were men). No, I actually just wanted to learn more about your company's business model.
I was copying my male friend's style of talking to other men, and I was interpreted differently. I've adjusted my approach now to reduce the chances of misunderstandings like that.