Halfway through reading this article I had myself really wishing posts like these would just publicly out the perpetrator instead of referring to them anonymously - unfortunately as I finished the article I realized that she hadn't done so because the perpetrator was never found out. For the cases where there is no question who the perpetrator is - I wonder if it would be beneficial to encourage more public shaming?…
One way we can make a difference is to refuse to tolerate that kind of thing in our own circles of acquaintances, because otherwise those individuals will take our silence as implicit affirmation of their worldview. Sometimes it's hard to be "that guy", but if you're not prepared to do it, then you're one of the people that's enabling this kind of behaviour. By not speaking out you're telling these people that what they believe is OK: silence is complicity, like it or not.