I’m not aware of any such bubble which forbids the use of the word “gender”. Which bubble are you referring to?
Disclaimer: I’m a queer non-binary leftist, and many of my community and loved ones are at least one of those. The closest thing to any “verboten” I’m aware of is “gender critical”, and as far as I can tell that’s mostly a term used by detractors in my own community, and even so it doesn’t reject usage of the term only usage of it distinguished from sex assigned at birth. The next most “verboten” I can think of is commonly referenced “wrong things programmers assume about ____” which generally offer no guidance other than not asking if you don’t need to know or offering open text input if you do, and in any case don’t represent a small powerful bubble of anything other than being a memorable link.
One of the possible explanations is maybe whenever you typed "gender" it suggested one of the two possibilities next to it or some kind of binary type which might be something github wants to avoid but I am just speculating.
