First, I think you're wrong. My wife does roller derby. I have gone to roller derby events with her. What do you think the male/female ratio is there? How many women there thought I was flirting with them? Zero.
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.