Ethan Klein is a sort of YouTube everyman. His average Joe shtick has attracted a respectable 6.5 million subscribers to h3h3Productions, the channel he runs with his wife, Hila. Klein serves up standard YouTube fare: he goofs around, dabbles in conspiracy theories (is the Pope a paedophile?) and weighs in on topical issues. By YouTube standards he represents a strand of uncontroversial mainstream opinion: he hates Donald Trump, parasitic bankers — and feminists.

We’re familiar with the idea that the internet separates us into political “filter bubbles”. Algorithms personalise our online experience, serving us content which confirms our liberal or conservative prejudices. But there’s another, perhaps more important, split. The internet is divided by gender.

This is not just a matter of algorithms. Online, men