The secret sauce was not having five monopolistic megacorporations running all our communications. The toxic assholes have always been here, but Facebook and Twitter is extremely good at platforming them and profiting off of them. This is why Facebook and Twitter had "world leaders policies" intended to keep Trump on their platforms - because Trump's fascist rhetoric made them money.
As for the standard pop-feminist take, I should point out that it's not so much a matter of gender or victimhood, it's a matter of how people are conditioned to respond to hostility. If your culture socializes boys[0] to respond to toxicity with more toxicity, then they will naturally push everyone else not so socialized out of the space. This creates "male spaces" that are just where the most toxic people happen to concentrate. The interests they concentrate around do not matter aside from them happening to be the color of the tile on the floor being stepped on.
As for the standard pop-feminist take, I should point out that it's not so much a matter of gender or victimhood, it's a matter of how people are conditioned to respond to hostility. If your culture socializes boys[0] to respond to toxicity with more toxicity, then they will naturally push everyone else not so socialized out of the space. This creates "male spaces" that are just where the most toxic people happen to concentrate. The interests they concentrate around do not matter aside from them happening to be the color of the tile on the floor being stepped on.
[0] Or just some subset of boys