How interesting Elegran, the origin of language is fascinating,I am going to look that up. 
Penstemmon, creating language is fine, stealing other peoples language, not fine. I know several M to F, two that pass completely, they were effeminate, gay men and found life easier as women. No one has a problem with people like this. there is a bloke in a nearby town who wears a dress, is over 6 foot tall and is very aggressive, no idea how he identifies though. I have also met men who have a sexual fetish about women and women's clothes. I don't have a problem with the first group but autogynephiles do not belong in womens dressing rooms. None of the groups are women, they are all male but I would respect their right to choose their name and pronouns.
The group I am most concerned with are children, children who may grow up to be healthy and gay but end up transing, or being transed to the opposite sex. Some of the material being shown in our schools is concerning. I find it deeply sexist, based on zero evidence with the most appalling pseudo science behind it.
The other group that worries me as is young women, they are damaging their bodies with breast binders. There is also something deeply homophobic about some parts of the movement, there is no place for lesbians, they either trans or accept male bodied people as partners cos hey, their lesbians too. The bullying of lesbians is truly awful, online and in real life.