@EfingNora is harming is the attempt to keep single sex spaces for women. And it's women who lose out when those single sex spaces go, not men.
Women before us have fought hard to make society fairer to women.
Some of the changes were to allow women to be included: the right to vote, access to university education, admission to professional careers such as being a doctor, promotions to the board room.
But other changes were to create spaces where men were excluded: men's toilets so that we can leave the house for longer than our bladders will hold, women's sports changing rooms and sessions so that we can have play sports, women's professional sporting categories, so that the best female athletes can have a sporting career, women's wards in hospital so that we dare access medical treatment whilst incapacitated, women's prisons where we are forced to shower and share locked cells with strangers, and sadly women's rape councilling where we can discuss our trauma without being re-traumatised.
Sadly, although the Equality Act allows for single sex spaces, there has been a systematic push to destroy them over the last 10 years. The law still holds (for now!) but social practice doesn't follow any more.
Not for toilets, as pp have noted.
Not in hospital wards, where it took an NHS hospital an entire year to admit that a woman had been raped by a person on the women-only ward with a penis. Despite holding cctv footage which showed the rape had taken place they continued to insist - to the police and the victim - that only women were on the ward, so the rape was impossible,
Not in prisons, where just this week a paedophile who raped multiple children - youngest aged 7 - was put into a women's prison with a mother and baby unit.
Not for sports, where athletes change from the Men's category to the Women's category from one month to the next. There might be hope here, since the cyclist who did that was later excluded. But many sports still allow it.
Not for rape councilling, where Sarah Summers is currently suing Brighton Survivors network for refusing to provide the female-only sessions she needed in order to heal. They barred her when she objected to a new participant joining the group, turning it non-single-sex, so this was no theoretical objection. Note that rape councilling charities which aim to provide female-only sessions are now denied funding.
We need to keep shouting that we need single sex spaces. That the need is due to biology - our vulnerability from being the type of human who can (possibly) have babies versus the type of human who reproduces by getting us pregnant. And that the need is to exclude people with male biology - it's that exclusion which makes single sex spaces fulfil the purpose for which they were created: which is to allow women to participate fairly in society.