I have to ask, as you are a girl, what is the most disturbing part to you about pooners?
Not the same woman you asked, but I find it's body horror, but body horror that comes
after the mind control/Pod Person horror.
At first it looks exactly like your friend or loved one, but it can only talk about gender and trans and self-pity, and it sounds more and more like
every other one of them does. But sometimes the turn of phrase, or discussion of something far-flung, sounds exactly like your friend used to--and then the trans hivemind is right back again.
Then the physical body starts to
change. Subtly at first, like a prodromal plague victim or someone with a Puppetmaster under their clothing, maybe with the gills of the
ST:TNG neural parasite sticking out of the neck, if only you knew what to look for. But it becomes more and more apparent, their behavior and words and now even their body becoming something--not just something
else, which happens when you hit the gym or get really into a new show, but something
the same as the whole rest of the horde.