I don't know but it is disturbing, and there are some who seem to actively hate women whilst wanting to be one.
I think most women are sympathetic to someone who genuinely wants to transition and is prepared to have surgery and go the whole distance (like Kelly Malone). But many women are worried about this idea that a man can identify as female (and still have his tackle) whilst accessing female only spaces as there are a few who don't appear to be genuine.
I must admit I find some trans women have very odd ideas about what it actually means to be a woman. A lot seem to be obsessed with looks (hair, clothes, sexy underwear, heels, makeup etc) when a great number of women couldn't care less about these things and don't define their femininity by outward appearances.