I think a lot of sexism towards women on the internet comes from the fact you can't have a cultural imbalance in one gender without an imbalance in the other. While there is income disparity for women along with human rights abuses, there are also human rights abuses for men which have been left unquestioned by society.
If a ship is sinking, and all the women and children get on the lifeboat first, there could be women who are evil or contribute nothing to society while good people who happen to be men, die. This is male disposability going hand-in-hand with the idea of women being trophies, which was more necessary in pre-civilization and not really now.
So logically, you can't be a feminist without being a masculinist. What's happening now on the internet is that more than ever before there are men becoming pissed off by the trophy ideals, and whether or not its the most rational way of balancing sexism, they are speaking for the same martial and cultural disposability for women that they were born into.