Sadly, when Starmer talks about the toxic debate I believe that he does believe GC people are the nasty ones.
I terms of the bell curve you have:
TRA/MRA
Allies - be kind
Not interested
Interested but not concerned &
Duh. Humans can't change sex
Pre-peaked and interested
GC.
Starmer & his wife graduated in the 1980's and became lawyers with Mrs S later retraining in occupational therapy & working in a north London hospital. They have supported progressive causes all their adult lives. The people they surround themselves with are progressive and they no doubt supported friends in winning rights for gay people to live as they choose. Many of us on these boards have held similar views.
But we don't live in a bubble and being allies ended [for me] when I saw how damaging TRAs demanding their rights was for women. I just don't think the Starmers are there yet. And cautious and lawyerly as he is, he might be able to acknowledge the biology, but he can't admit -and perhaps can't see - the harm the trans rights movement can do. He wants JKR & Rosie Duffield to pipe down and stop making this so difficult.
When he says we should detoxify the debate, I'm afraid he means GC women.