Oh wow. OK Ill try.
Vicky - Personally, I think we make it happen through education, mutual respect and importantly, not demonising people. By understanding the motivations of those around us and learning about their experiences. Will it happen overnight? No. But luckily, people are more and more understanding and empathetic. Young people are increasingly confident in sharing spaces, and gender is increasingly becoming broader. It is no longer as acceptable to assume things of people based in their sex.
As for, 'I'm just one person, I can't change anything'. Pish. Be the change you want to see in the world. I take precautions, but not against men. Against disrespectful and dangerous people.
Hypolyta - Actually an increasing number of trans* and gender questioning people do not take medical treatment. Jack would not be able to forgo his arm and mould a penis until he is an adult. Until then he's just questioning his gender.
Also Hippolyta of course I would not be comfortable sharing a prison cell with him. Should he transition, I would want him (or her) to be placed in similar accommodation to other sex offenders and be under watch. If that's in a female prison then so be it. Just like I would expect risky female bodied prisoners to be placed in appropriate accommodation. Any risks come from inappropriate and inadequate safeguarding. I understand and recognise that prison is a trickier one to untangle though.
Of course, I know it might be difficult for some people to understand. I fight hard every day to challenge the gender ideals I've been taught. I was uncomfortable when I first saw a trans person in the 'women's' changing room. After I spoke to them though, that fear alliviated. (sp?)
How can I possibly challenge anyone who believes in the female brain, if I perpetuate stereotypes about the male brain?