I feel some might think you as being transphobic is that you claim absolute knowledge of things that many will see as nothing more than opinions
That's not transphobia. At worst, it's arrogance. I see it as a statement of fact.
It's your opinion that biology is an absolute. It may not be the opinion of others
I don't think this sentence is as simple as it looks. Am on my phone too, so this is likely to ramble and contain no discernible structure!
What do you mean when you say that biology isn't an absolute?
Is it simply acknowledgement that there is variation in the system? Such events don't necessarily invalidate the system. I work in genetics and sometimes see unexpected biological outcomes - this doesn't mean Mendel was wrong. Not every person falls into a neat category of biological sex, sure. But most - the vast majority - do, even those who are 'intersex'. The only way to argue that sexual dimorphism is a myth is to expand the definitions of biological sex in a way that doesn't match what happens in the bazillions of individual organisms that populate this planet nor the isolated nuclear DNA I work with at my bench. Are we really willing to see females with PCOS labelled as 'intersex' to support a political campaign? Do post-menopausal females become intersex? I've got small boobs and a few hairs on my upper lip - am I intersex? If biological sex is a construct, I should be very surprised today when I find that putting a male mouse in the same cage as a female mouse has resulted in baby mice?
That biology is absolute isn't surprising. The definition of a male and of a female is biological. It has to be absolute, not philosophically but semantically and etymologically.
What you might be saying, I think, is that the way we assimilate maleness and femaleness is open to interpretation. I agree. As far as I'm concerned, males make sperm and females make eggs. This feature is not always predictable by DNA analysis, nor by morphological inspection. Most of the time, it is though. If aliens came to earth and studied the entire cohort of newborns on the day they landed, I believe that sexual dimorphism (based on morphology and DNA analysis) would be one of the first conclusions they'd draw.
Hmm, will stop as this probably isn't particularly coherent now. Will get back to my computer soon.