Here's the thing.
Just because males have been using provisions, which under the EA are supposed to be single sex under the exemption clause, 'for years', doesn't mean that they ever should have been there or weren't violating women's rights to privacy and dignity. It isn't a right they had, so it's not a roll back.
Stonewall has demonstrated this trend of 'running ahead of the law'. It doesn't mean we should play along with this until the law 'catches up'. No we are well within our rights to stand up for our rights and to start to enforce them, precisely because of this creep by males to override the law by for cable means and outright intimidation and emotional blackmail.
Even asking the question about That GC people want to stop them using women's loos? Is a deliberate and very cynical attempt at intimidation and emotional blackmail to force the idea that transwomen have always had a right that has never existed in law, and 'aren't you being mean' for challenging males for 'just wanting to pee'. Of course it's not about peeing safety at all. It's about validation and in some ways a deliberate colonisation by a wider group of males for more nefarious reasons. Neither of which are about safety.
The issue is and has been the proper enforcement of women's rights hasn't been done in the first place when it should have been. Leading to their actual erosion in practice and attempts to follow this through in law. Woman in being socialised to be amenable to others have really just sat there and been walked all over because of their well intentioned, biting of lip.
In reality the EA actually gives males the right to use single sex provision without discrimination. So in other words males shouldn't discriminate other males on the basis of their appearance when it comes to access to toilets.
In short TW should be using male toilets without fear because its about safeguarding not validating feelings.
Which toilets males use should not be a problem for women. It's not a female issue. It's a male one.
Trans people should have the right to feel safe using single sex provision - but that doesn't mean they should automatically get access to the provisions of the opposite sex to which they were born. Their provision remains the sex they were born.
This isnt hard to understand