My feeling, after watching Jack's behaviour the past few weeks, is that she's a bit of a sociopath. A while back there was a trans Labour activist called Lily Madigan. Their name had been Liam.
Madigan stood as a Woman's Officer in Kent and then got involved in student politics, then was in Labour. They had caused loads of trouble at their school and were absolutely toxic. Then they disappeared. They studied at Goldsmith's and there was a nasty episode where a female friend quit the Uni and took an overdose or something, because Madigan organised a hate campaign.
Anyway, when I read Jack's tweets it is exactly the same language/style as Madigan's. Carbon copy. When Madigan was on TV they couldn't speak, voice shaking, nervous. But online, a complete bully and aggressive and sarcastic and vicious.
Just like Jack.
So I think Jack has some kind of personality disorder. A narcissist, yes - but also a sociopath. She never leaves her house, she exists solely online, she talks to people and treats people online like dirt, while saying "Be kind", and she seems to have no friendships or real human relationships.
It just reminded me yesterday of what that Madigan person did a while back. It used to be on Mumsnet and it really is carbon copy. Anyway, rambling over!!