This is one of the (many) problems with identity politics, in general. The individuals spouting this stuff don't even have a basic understanding of what left/right wing mean, the power relationships within capitalism, what patriarchy is, what facism, liberalism, Marxism, feminist etc etc actually mean.
Moreover, they don't seem to have grasped that The Equality Act didn't appear from nowhere in 2010; it's part of a progressive wave of legislation, building on/replacing the DDA, Equal Pay Act etc etc.
Hence, that discussions about moving from 'sex' and 'gender assignment' being protected characteristics to 'gender identify' necessitate a discussion about who will be affected, in what ways, by whom.
It's demonstrative of the absolute narcissism of their position that they don't grasp that women are trying to talk about how this legislation will affect them. It's not that feminists particularly want to talk about trans issues when discussing the legislation, it's just that there is no choice when considering the possible impact on women.
They have no sense of the perspective of women at all, or even that there could possibly be other points of view. Any attempt to suggest that feels like an attack on a fragile, unstable, nonsensical ideological position, which is why they get so angry.
Other points of view, or even saying 'let's think about this a bit', threaten to annihilate their narcissistic ideologies, and they internally experience it as some sort of 'fascism'.