I have read Twitter (I am very new to this whole debate) and the thing that frustrates me the most is the lack of reasoned argument from the TRAs.
I am a lawyer. Part of my job is to critically evaluate argument. You can only undermine an argument if you understand what it is. There is no point arguing with the statement "they sky is blue" by saying "the sky has clouds in it". You have to say "I understand X is saying the sky is blue, but it is in fact green for these reasons".
I see no evidence of anyone on the other side of this debate having understood what JKR and others are trying to say. It is either (a) saying that she is bullying transpeople, without any explanation of why or what her motivation might be (b) that she doesn't really know what she is saying. There is no acceptance that there might be any points of validity in what she has to say.
I have not seen anyone say "I understand JKR to be saying this, however I don't agree that sex based protection is necessary because Y".
It may be because I am new to this that I have not read around the issue sufficiently.