I only have vague memories of the program Ab Fab, but one of the episodes I watched had..um.. the Jennifer Saunders one [sorry, I did say 'vague'] pestering her straight-laced daughter 'Are you sure you're not gay dahling? really? definitely not gay? not even a little bit lesbian?' because it would have been so cool for her to have a lesbian daughter.
Any resemblance between ..Edina I think it was ..and real-life Cynthia Nixon would be entirely coincidental!
It sounds like 100% fad/fashion/contagion/wanting to be in with the cool kids to me.
I'm just surprised that all these show-biz kids haven't rebelled into wearing sensible shoes and nice cardis and taking up accountancy, like... Saffi, that was the daughter's name, it's all flooding back!
Maybe celebrity parents pretend to be so proud of their trans kids in the hopes that they'll think 'Oh gross, mom thinks it's cool ..'😄