As Michelleoftheresistance said.
"I get to label you, even inaccurately"
"You do not get to label me, even accurately"
Who holds the power? The namer.
You can only bend reality for a small window though. The spell breaks. Even those that submissively adopt the false naming protocol start to mentally substitute cis for biological/real/actual. It can't be helped.
Because that is how our brains organise language.
If I tell you from today an apple is called a trans-orange, part of the same category as a cis-orange and you try to conform, within a short time your brain will treat a trans-orange as an entirely different category from a cis orange and you will cease to believe they belong in the same category anyway.
The naming magic wears off before long, because our brains still can see that they are fundamentally different, despite contriving a false linguistic similarity.
See:
apple /pineapple
bird/ladybird
dog/hotdog
before too long, reality takes over, the obvious dissimilarities reassert themselves, and the naming-spell is broken.