There's more hints of this in her article. It starts out by complaining about "aggressive communication on pull requests" and how little the men respected her opinion.
In quite some years working in the software business I have occasionally seen men and women genuinely be dicks on code review threads, but I have never once seen an entire group of people be dicks simultaneously. What I have seen, repeatedly, is people who do not have any engineering background bump up against the no nonsense, no bullshit get-it-done-now attitude that is pervasive in the software world. This is especially a problem for people from fuzzy marketing-type backgrounds, which is what this woman has, and especially on code review threads, where reviewers always have a backlog and writing each line-by-line comment as if it were a formal business letter would waste staggering amounts of time.
My experience has been that men love it when a woman turns up and gets real, respectable work done! What men definitely don't love is when they reply to some request saying "That won't work because of X" and this is interpreted as aggressive by the person whose work was not up to scratch (whether it be men or women). If she couldn't get respect on her code review threads and perceived the communication as aggressive, I bet the real story is that nobody was being aggressive but her work simply contained lots of mistakes, and having them pointed out without any cushioning (as is normal) hurt her ego.
Reading this story has not made any difference to my desire to work for github. It has reminded me of other times in my previous job where similar issues cropped up, though not normally so publicly. The genuine fault ALWAYS lay with the complainer.