There's nothing like an argument from authority to establish one's commitment to the scientific method.
There's nothing like dismissing any and all arguments made by
actual scientists, to make it plain that you are hawking pseudoscience.

You are fractally wrong.
1. What I dismissed contained no arguments, just an ideological slogan. How many times does it need to be pointed out that an argument is a connected series of statements intended to establish a definite proposition? "Biological sex is a label assigned by a medical professional at birth based on physical characteristics (genitalia) and other biological determinants." does not, by any stretch of the imagination, qualify. And as ideological slogans go, it is more imbecilic than average, for reasons I pointed out.
Your example of dinosaurs sets the gold standard for imbecilic arguments. Until you can provide actual scientific evidence that dinosaurs actually thought in terms of different sexes, you are simply spouting nonsense.

Why the bejesus would dinosaurs need to think in terms of different sexes in order to have biological sexes? Good lord, man,
jellyfish have biological sexes, and they don't think
at all, lacking central nervous systems. You appear to be making the same sort of map-territory mistake the ASRM made.
ASRM is not denying the existence of biological sexes, so what is the point of your ravings?
Under "Medical and Scientific Facts About Biological Sex", the ASRM led off with "Biological sex is a label".
There were no labels in the Mesozoic Era! If it really were a medical or scientific fact that biological sex is a label, then it would follow that dinosaurs did not have biological sexes. But in point of fact, dinosaurs had biological sexes. Therefore biological sex is not a label. Therefore the ASRM's claim is false. Therefore the ASRM making a claim in a list it calls "Medical and Scientific Facts" is not a good reason to believe it's a fact.
This is IIDB. We're
infidels. If Politesse wants us to believe something is a fact then he should provide a good reason to believe it's a fact -- he should provide
evidence, not an argument from authority. Argument from authority is for believers. That is the point of my ravings.
What I dismissed was not promulgated by actual scientists. As you said, the source is the American Society for Reproductive Medicine. They're doctors, not scientists.
This is, as you say, fractally wrong.
Why? Because you say so? Have you even been to the ASRM's website? It's a physicians' industry association. If you have any evidence that the person who wrote
"Biological sex is a label assigned by a medical professional at birth based on physical characteristics (genitalia) and other biological determinants."
was an "actual scientist", feel free to present it.
Do you think it's possible for a label to exist without a label-maker?
No, I don't. And no, consequently I don't think dinosaurs considered themselves men or women, let alone "biologically male" or "female".
"Considered themselves"?!? Oh for the love of god! Do you seriously think whether a dinosaur
knew what sex it was has any bearing whatever on whether it was, in point of fact, biologically male or biologically female?!? Let's try that again...
Do you think it's possible for a label to exist without a label-maker?
No, I don't.
You might as well have stopped there -- you agree a label cannot exist without a label maker. Biological sex is not a label. The ASRM's "fact sheet" contains a false claim. Game, set and match.
Social categories are always imposed on, not found in, the natural world.
Well, in the first place, that's human exceptionalism. We find plenty of social categories in the natural world. Humans aren't even the only species with
wars! You think when a pride of lions systematically kills off another pride of lions, the lions don't have an "us" social category for the lions they're cooperating with and a "them" social category for the lions they're killing? The human capacity to construct social categories didn't spring fully formed from the brow of Zeus; it evolved from animal precursors.
And more to the point, in the second place, biological sex is not a social category.
Gender is a social category.
Arguing about whether or not Pluto is a planet is never a question of whether Pluto exists, but rather about what it should be labeled. Likewise, the biological reality described by our sex and gender terms has always existed, but our labeling of it has not, and indeed no one was talking about "biological sex" until the beginning of the 19th century when some of its contours were becoming better understood.
Are you seriously suggesting that whether the Tyrannosaurus named Sue was a male or a female is an "Is Pluto a planet?" type of question, as opposed to an "Is Pluto's rotation prograde or retrograde?" type of question?
Terms like "Man", "woman", and "Bathroom" are considerably older than that, and they come with huge rafts of cultural, religious, and historical baggage that preceded the scientific era.
Yes; and the whole point of talking about "biological sex" instead of just "sex" is to recognize that that cultural baggage exists,
and set it aside.