What a snide, ageist, deliberately provocative little article that is. That aside, 20% of polled MNers (and indeed, some of them may well be men but the article focusses, a tad obsessively, on 'hypocritical' middle-class white mums approaching middle age) is 1 in 5. I understand the current polls estimate around 30% of the general population consider voting for Reform at the next election, so MN is actually polling below the general population in terms of support.
That said, what's happening outside of MN is also happening here. People are, to generalise, less tolerant, more goady, more likely to say awful hurtful things behind the cloak of anonymity, and less able to appreciate nuance. Subtleties are a thing of the past. You'll see this on all social media platforms, right across the board. I've been on MN for 19 years and the place certainly has changed (mostly not for the better IMO) and is no longer as obviously left-leaning as it used to be. Posters are coming out with fairly hard-right views far more confidently than I can imagine being possible ten years ago. But that's the case nation-wide too. People feel emboldened now. Social media mostly to blame, I suspect.
FWIW, I'm a longterm poster, still definitely left-leaning, but one of these pesky Bad feminists who like to keep their talons into all those hoarded rights and safe spaces. I would rather gnaw my right hand off than vote Reform, and I can't imagine ever voting Tory, even to keep a Reform bastard out. I'm not moneyed, don't send my kids to a private school, and neither don a keffiyeh for a protest, nor lobby my MP about immigration.