Mumsnet is the only site which has consistently permitted frank discussion of issues arising when the rights of two groups conflict. That they do conflict is inevitable, because we are talking about two separate groups, with different biologies, who have faced different forms of prejudices and separate experiences on account of different socialization as 'gendered subjects' (ugh @ that phrase) and different bodily make-up.
Elsewhere, Reddit, Twitter (as was) and other online discussion forums rigorously edited and banned such content. Mums from an Australian forum wound up here because their own discussion forum had been closed down. MN was consistently infiltrated, with inflammatory threads made on FWR and their content posted online, in an attempt either to have the site closed down, censored, or at the very least have its reputation cemented as a 'hotbed of transphobia'. #NoDebate was taken to its nth degree. In no other context would such attitudes ever be deemed healthy or desirable. You know what they say about societies who start by burning books.
Concern at the rollback of women's rights is not transphobia. Concern that the dilution of language used to describe female biology and consequent uniquely female experience, is not transphobia. Recognition that women and trans women are separate groups, with different physical make-up and consequently different needs which deserve consideration on that basis, is not transphobia.
Women are angry, and in some instances undoubtedly this might be perceived as transphobia. I'm not one who 'misgenders' people. There are arguments as to why others do. In such contexts, I merely engage in linguistic contortionism to avoid use of sexed/gendered pronouns at all. That way, no one can be offended.
Trans rights activists, on the other hand, make a beeline for women. They dox. They threaten. They attempt (and have succeeded) in destroying their livelihoods. They make a particular beeline for female victims of rape and sexual assault. These activists never make a beeline for men. Men's facilities are not altered to accommodate mixed sex: women's are. Men are not put in dangerous situations in contact sports simply by virtue of their biology. Women are. Men are not reduced to the dehumanising language of their genitalia; they do not have their status as fathers downgraded. Women have become 'birthing parents'.
Transphobia is the label-non-grata: the one people apparently dread facing unless they are viewed as the interminable 'bigots'. Those insults are rapidly starting to lose impetus through overuse. Misogyny, on the other hand, is a-okay. Including, sometimes especially, coming from other women.
TLDR: long post. No apologies. This shit needs challenging where it's seen.