Also, those weren't my words that you edited - they are the words of Zach Elliot, an evolutionary biologist.
Then Zach Elliot was wrong too.
Argument from authority isn't edifying, even when it's not being used by creationists.
As a biologist, I can assure you that that's not
the definition that
biologists use. It's
a definition that
some biologists have used in some context.
That remains true whether you contradict it, or Zach Elliot does, or anybody else does.
There's no pope of biology who hands down unarguable and infallible definitions of stuff; There's a lot of biologists who mostly agree on most of a common language to describe the stuff they care about.
Okay Mr. Biologist. How do you define male and female?
How do you tell what sex a cow is? Or an alligator? Or a flamingo? What definition of sex do you use that is universally applicable across all anisogamous species?
What makes you think that I use any definition of anything that's
universally applicable?
Shit, there's not even a universally applicable definition of "species".
Biology is messy. Defining characteristics and putting things into to pigeonholes thus created is often a helpful way to reduce the messiness and get insights into some generalities that are broadly useful in understanding stuff.
But it's not a reflection of any underlying reality, and so there are important and significant limits on how helpful this approach can be.
You appear to be mistaking the map for the territory. Categories can be useful, but the closer you get to their boundaries, the less useful, and more potentially misleading, they become.
Responding to my argument that categorisations are an inherently flawed way to describe reality with "OK, if you're so smart, you tell me what categories to use and how to fit reality into them" is a strong indication that you're not even discussing the same level of abstraction that I am.
I, like you, have no difficulty whatsoever in fitting the vast majority of individuals of all anisogamous species into one of two categories.
Where we differ is that you appear to think that if it works for 99.9% of individuals for 99.9% of purposes, it's therefore absurd and stupid to even consider the possibility that it might be impossible to categorise some individuals into these two boxes for some purposes.
Arguing from the general to the specific is a logical fallacy. Men are typically taller than women, but that doesn't mean you can't find any women who are not taller than any man. Humans are typically male or female, but that doesn't mean you can't find any humans who are neither, or both, for any given definition of these categories.
Categories help us to understand reality, but they don't change reality. Definitions tell us which box an individual belongs in, but there are many different definitions of sex and gender, and while there's a lot of overlap, the idea that all of them will generate the same distribution of individuals into categories; or that there's one "correct" definition that overrides all others, is simply not reflected by reality at all.
Even if you feel incredibly strongly that there should and must be.