You are overreacting Poulo to
accuse mumsnetters of".. demonising, deriding, mocking and probing into trans people's identities."
Show me some concrete examples of this Poulo.
What we are doing here on mn is
(1) Applying blame where it is due (eg Mermaids person having her offspring seen to)
aka demonising;
(2) Bringing attention to victimist claptrap (eg you misgendered me! It's literal violence!)
aka deriding;
Calling out fantasist ramblings - soon to be incorporated into English law as man becomes woman (eg a transwomen has a period)
aka mocking, and
(4) Practising critical thinking regarding trans people's claimed identities (as before, soon to be made law) (eg I am a woman with a lady willy" or, worse, "That so called terf bigot lesbian won't fuck me even though I'm a real woman with a Clit-on-a-stick and everything : woe is me")
aka probing into trans identities.