It is dehumanising. It also means that every single thing that affects women gets separated out into a separate issues.
Discriminated against because you menstruate? You need to campaign with other menstruators.
Discriminated against because you breastfeed? You need to campaign with other breastfeeders, but of course you will need to rename yourself chestfeeders.
Discriminated against because you are pregnant? You need to campaign with other pregnant people.
Discriminated against when you applied for a job/promotion because you look like you might be pregnant in the near future? You need to campaign with other ... hmm. Maybe uterus havers or people who pass as uterus havers. That one's particularly catchy.
Discriminated against because you were assigned female at birth and are now developing wrinkles, grey hair and a less than perky figure? Tough, what do you expect, you witch! Be grateful we let you live.
There was a time when we could have said 'Oh look, this only happens to women ... and so does this ... and this .... It's almost as if all these things happen to women and not to men! Maybe we could band together and do something about it?' Not any more.