"Gendered bigotry against women is widely considered to be "in bounds" by Internet commenters (whether they openly acknowledge it or not)"
That is not true. It is more a case of people thinking that their singular effort won't have any effect and not wanting to put in the effort, for they have lives to lead. They have friends, family, jobs, etc... And they have enough things to do as it is.
It's not so much acceptance as the fact that talking about it makes people uncomfortable. So nobody talks about it, so everyone thinks that they're alone in the matter. And so they give up, saying "well, that's just how it is".
This doesn't mean they consider it "in bounds", it means they're unwilling to put in the effort, because it may affect their lives and their social circle. It may affect how they've grown accustomed to spending their free time and even how they spend their income.
"we can start by creating a culture that shames individuals who cross the bounds of decency."
That will achieve an opposite effect. You're dealing with people lacking in social graces to begin with. And you're going to respond by "shaming" them? Very ambiguous by the way. The description seems to come down to "telling them it's not acceptable and trying to reason with them".
The person who wrote all this clearly does not understand what a troll actually is.
Trolls are to be ignored. Saying that that isn't enough shows 2 things:
1. You don't want people being treated right, you want punishment for those who offend you.
2. You aren't ignoring them at all. Which is obvious from point #1