The Sad Truths of Internet Trolls:
Trolls are immune to criticism and logical arguments. True trolls cannot be reasoned with, regardless of how sound your logical argument is.
Trolls do not feel remorse like you and me. They have sociopathic tendencies, and accordingly, they delight in other people having hurt feelings.
Trolls consider themselves separate from the social order.
Trolls do not abide by etiquette or the rules of common courtesy.
Trolls consider themselves above social responsibility.
Trolls gain energy by you insulting them.
Trolls gain energy when you get angry.
The only way to deal with a troll is to ignore him, or take away his ability to post online.
How Exactly Do Internet Trolls Abuse Others?
Internet trolls seek to be disruptive and hurtful by using any of the following techniques:
Trolls will post abusive and hurtful comments directed at a specific person (aka "flaming" another person)
Trolls will incite broad arguments and provoke angry responses by making controversial statements. (e.g. racism, religious intolerance, bigoted or elitist views, mysogyny, extreme political views)
Trolls will narcissistically dominate conversations, trying to make themselves the center of attention. (e.g. nonstop comments about themselves and their accomplishments; repeated self-centered statements and bragging)
Trolls will start many off-topic threads, seeking to derail users from the focus of an online community.
All sounds reasonable to me. Why did a woman post hateful messages to another woman? Because she was a troll. Does society hold women to a higher moral standard than it does men? It would seem that it does, yes, look at Fred and Rose West, Myra Hindley and Ian Brady, the men are hated, yes, but the women were villified in a completely different way. Do women, even feminist women hold women to a higher moral code? Well, yes, sometimes, because we live within a society which treats women as other, we internalise that belief, and even though, as feminists, we are fighting against that (among other things), we still sometimes do it.
Occam's razor cuts both ways.