I have worked as a programmer for 25 years and I can assure every woman out there that men often treat other men very badly. I have seen programmers go ape shit because someone changed their code. Deliberately criticize another's work in front of a group in order to undermine them. Men play politics and undercut other men to boost their own reputation and career chances.
Some of the twitter comments identify sexist situations but some look to me like a man being a douche for reasons that might have nothing to do with sexism. We do not want to develop a culture where any comment to a woman/gay is always interpreted as sexism/homophobia. Let's not allow the pendulum to swing from one extreme to the other.