Calling it "gender" instead of "sex" would really fuck up the narrative for these people. A persons sex is scientific standard language. A persons gender is how they feel at that particular moment.
I think this is a great way to start fighting back and changing the narrative.
Just start calling people like dog breeds.
https://hi5dog.com/what-do-you-call-a-male-dog/
Bitch = Female in heat.
Dame = Female with a litter.
Stud = Male virgin .
Sire = Male with a litter.
Eunuch = Trans-bomination (biological male)
https://en.wikipedia.org/wiki/Eunuch
Barren = Trans-bomination (biological female).
We call our dog a eunuch 😂