Okay very basically this whole thing started with a hypothetical posed to a bunch of women about which they would rather run into while alone in the woods; A random man, or a bear. A lot of women chose the bear. Reasons varied from "The worst the bear will do is kill me," to "At least I know the bear wants to kill me," with a general theme seeming to be that whatever tangible threat the bear posed was preferable to the uncertainty of wondering whether or not a random man would assault them.

The poster's stated goal with the hypothetical was to get men to think about why the women were choosing the bear. Instead a lot of guys took it as a personal attack, like they were being punished for the actions of other men. Many started attacking the question, insisting that bears are way more dangerous than virtually any man. This led to a lot of dismissive responses of the criticism like "This is why women choose the bear," or talking about women's safety being more important than men's feelings.

I'm simplifying a lot but that's the basic gist of it.