There are all kinds of misogynistic groups and subcultures on the internet. PUAs, gentlesirs, MGTOWs, and redpillers, just to name a few.
But they're all small potatoes compared to followers of the so-called "Philosophy of Rape". These guys? They blow all the others out of the water. They have a subreddit that promotes corrective rape of "sluts" and "feminazis" and promises to help rapists get away with their crimes. And its founder claims to have raped seven women.
Thankfully, there seem to be very few of them, but these are some "philosophers" who, in my humble opinion, could use a little hemlock.