I've seen this argument a few times, but I don't think it holds up
The majority of trans people have/had functioning genitalia. Gender identity isn't restricted to the set of people outside the crudely simple vagina=woman penis=man classification
There's a spectrum of opinion which is easier to consider with hair color identity as opposed to gender identity
If there's blonds & brunettes, the existence of redheads doesn't mean blond vs brunette is moot. & don't even get started on dirty blonds. But if a blond dies their hair brunette, are they blond or brunette? Their roots still say blond. But they put much care into dying frequently enough that the roots aren't visible. So society accepts them as brunette. Meanwhile the more pro-identity group will argue that not only is the blond brunette, but has _always been_ brunette[1]
The latter argument is much harder to defend, & from what I can tell arguments tend to do one of two things:
1. both parties focus on arguing against the weakest arguments of their opposition, leading to two parties talking past each other
2. both parties shift the argument to the most debatable point either way, which can often shift the dividing line of for/against to be at some extreme as opposed to in the generally accepted gray area between the extreme & the counter
Full disclosure: I'm fine using people's preferred pronouns even if I believe in biological gender (ie I don't believe pronouns need to be tied to biological gender, because while I generally need pronouns for everyone I may refer to, I generally don't care about their genitals). That said, I mostly find gender roles a hassle; being a man who has enjoyed wearing a dress & putting on nail polish doesn't mean I identify as a woman
[1] out of politeness one may not want to make a point of randomly pointing out that a brunette haired person was actually born blond, even if they don't believe they were always brunette
The majority of trans people have/had functioning genitalia. Gender identity isn't restricted to the set of people outside the crudely simple vagina=woman penis=man classification
There's a spectrum of opinion which is easier to consider with hair color identity as opposed to gender identity
If there's blonds & brunettes, the existence of redheads doesn't mean blond vs brunette is moot. & don't even get started on dirty blonds. But if a blond dies their hair brunette, are they blond or brunette? Their roots still say blond. But they put much care into dying frequently enough that the roots aren't visible. So society accepts them as brunette. Meanwhile the more pro-identity group will argue that not only is the blond brunette, but has _always been_ brunette[1]
The latter argument is much harder to defend, & from what I can tell arguments tend to do one of two things:
1. both parties focus on arguing against the weakest arguments of their opposition, leading to two parties talking past each other
2. both parties shift the argument to the most debatable point either way, which can often shift the dividing line of for/against to be at some extreme as opposed to in the generally accepted gray area between the extreme & the counter
Full disclosure: I'm fine using people's preferred pronouns even if I believe in biological gender (ie I don't believe pronouns need to be tied to biological gender, because while I generally need pronouns for everyone I may refer to, I generally don't care about their genitals). That said, I mostly find gender roles a hassle; being a man who has enjoyed wearing a dress & putting on nail polish doesn't mean I identify as a woman
[1] out of politeness one may not want to make a point of randomly pointing out that a brunette haired person was actually born blond, even if they don't believe they were always brunette