If gender identity is not biological, what is it?
That's... that's the point. I'll refer to you however you want to be referred (inb4 helicopter joke). There's nothing more to it. Just accept other people's preference and move on with your day. It's that simple.
For instance - it was once considered perfectly masculine behavior for men to wear pantyhose, high heels and makeup, and to kiss each another on the mouth. Now, those traits would likely be considered feminine (or at least, not masculine.)
Does that mean men were formerly somehow more biologically female, because they expressed what we would consider feminine traits? Obviously not. Was their gender female, then? Not in the context of their own culture, they were men being what men were considered to be.
It does mean the constructs of "masculinity" and "femininity" are not innately biological, and that the correlation between sex and gender is mostly a manifestation of cultural norms, not biological imperative.
All of the confusion in your comment seems to stem from the assumption that sex and gender are a priori the same. You may find Wikipedia's article on gender to be useful[0].
Visible light is a spectrum, yet we still use labels for distinct colors, despite "color" being arbitrary (a "social construct".) Labels can still be useful for communicating concepts and establishing a common ground, even if they're imprecise, or if different cultures don't even agree on the difference between "blue" and "green."
>Do a Ctrl+F of the linked article for "Gender" and "Sex" and then tell me that the research isn't also confused because everyone is confused all of the time, especially people who are "confused".
Everyone isn't confused all the time. People do disagree, though, and society is still working out just what gender means in the modern day.
If you believe that a persons gender identity is put onto them by the expectation of society, might as well forcibly decide which identities are valuable and supress all the rest. It would have no downside.
Also, motherhood and fatherhood are biologically gender-linked roles. They are measurable biological phenomena that tie strongly into your definition of gender.
This is not an extremely recent development in the slightest, the distinction was being made almost 60 years ago in modern dictionaries.
> The exclusion of sex from gender is an extremely recent development that isn’t widely accepted yet.
What are you talking about? The use of gender as a sex “role” was coined in 1955, over 60 years ago. Before that “gender” referred to grammatical gender, not to people. So if you use “gender” relating to people, that form of the word has always meant the social aspects of sex, not the biological aspects. https://en.m.wikipedia.org/wiki/Gender
There was never a time when “gender” meant the same thing as “sex”.
> Also, motherhood and fatherhood are biologically gender-linked roles.
You’re confusing yourself. Being a mother & father are sex based facts. Fatherhood and motherhood as words that can mean that someone is factually a mother or father, or it can in context be referring to the gender roles of motherhood and fatherhood. The stereotype of a father playing catch with a son is a gender role, not biology. You’re choosing words which have both meanings, which doesn’t help you understand what sex and gender actually mean.
1. https://www.tandfonline.com/doi/full/10.1080/23273798.2018.1...