From the linked reddit thread..
Starmer is not saying this in response to the government discussing the GRA. This is his response to one of his own MPs abusing her platform to lead a campaign of bullying and harassment against an extremely vulnerable demographic.
Eh? Campaign of bullying and harassment? I must have missed something very sigificant here..I thought Rosy simply stated her support for womens rights acknwledged the clash between womens rights and what activists are demanding, and took a bit of offense (as will many women) at the word 'woman' becoming some sort of dirty word. Who did she harass, assuming the meaning of harrass has not also changed meaning and is now 'disagrees', like 'attack' and 'wish they don't exist' and such.
People on there claiming Rosie doxxed former employees also. Missed that too oddly. IF she did, which I am highly doubtful about, thats obviously wrong. But still, of course she does not deserve endless threats of violence and death. So if thats why 'harassment and doxxing' have came up, to excuse the miogynistic abuse, it really does not defend the abusers in the way they think it does.
Most of the thread, as expected is a fucking mess. Seeing them trying to convince themselves that 'noone cares what TERFs think' is slightly amusing, given 'what TERFs think' matches the overwheming majority of public opinion (when polls are clearly worded, instead of purposely fudged/vague of course). They do not seem to realise, that its not 'sex matters' thats the niche opinion, its those who reckon sex is not important or not even a real thing and a feeling in ones head overrides the sex picked from a sorting hat each time a baby is born 
A fair few comments along the lines of 'why did he not take the chance to affirm he will give transpeople more rights if he gets elected, he would certainly get elected then'..which..is pure fantasy. Abandon half the population, and kill Labour off even more really.
Many TRAs would have a field day on that thread, as a few seem to acknwledge that transwmen in womens prisons and sports, and medicating kids is something that needs discussion (just not any other part of it). Which of course means some of those screeching terf at others, are terfs themselves.
Disappointing that he did not take the oppurtunity to condemn the death threats against Rosie though, but ot entirely surprising. He will get MUCH shit for this 'middle of the road' comment alone. I wonder if his office will be bombarded like other MPs who do not toe 100% the transactivst line. I have a feeling it might be a bit of an eye opening for him, he will see the toxicity amplified beyond belief, and maybe realise its all from one side. Before now, it will have been sweetness and pleading and misrepresenting and guilt tripping. Now, it will turn extremely sour, quickly and the tsunami will hit.