Comments that are specific, who's facts is discussable, are constructive in both identifying with facts what is wrong, and suggest solution in a scientific manner will be up voted.
It doesn't matter if its male or female voice doing this.
As for scientific manner; there's a lot being discussed on HN that isn't scientific. Although related, hacking is broader than science.
And I'm sure it's just a coincidence that we as a male-dominated community get especially skeptical whenever feminism comes up.
Why normally demand performance tests and security validation on claims regarding software, but I hear people argue that somehow we should not demand any proof for anything related to sexism? In what way is it unrealistic to demand that people test and confirm statements such as "irc comments are the major reason why women don't participate in software projects". I for one would like to see the average number of sexist comments on 100-2000 observed IRC channels over a set of months, and compare that to a control group of irc channels not related to software development. More or less?
Testing and verification is not unrealistic. Its is unrealistic to demand that we don't ask for it.