My CS lectures barely have any women. 1/10 students in a class of 200-300 are women. In more difficult/less mainstream classes (operating systems, networking, sometimes PL theory), it's 1/20. The game development club I'm in has 2 woman in it (including me) out of the ~20 people that regularly show up. This is in 2019-2022.

My school also hosts a hackathon for women and underrepresented gender minorities every year (organized by a student org that rents out a building from the school for it). The hackathon is also open to high school students. Many people I've talked to there talk about how they only went into CS because someone they knew invited them to the hackathon, or have made friends and feel less alone in CS because of it.

There's a real need for these groups. Whether men needs their own groups is a separate discussion that I have no real stance on.