You guys bring up some good points above.
Xandaca's post is really good telling a history of words. Problem is in present day I don't think anyone (especially activists) give a shit about history. They just want what they want how they want it now.
CGiRanger's quick post is similar to me. If it wasn't for all the social media and trans stuff the past 5 years, I thought Sex and Gender were the same thing. It's like filling out a form. Some use Sex, some use Gender. Interchangeable. Maybe in modern day forms they might have both demographic metrics to fill out, but I bet if you pull out random blank forms, that box you fill out will say M or F no matter what the company labeled that box. So it shows even government and companies can't even tell the difference.
As for me, I will stick to the scientific route. If that's what JK Rowling was doing in her old tweets, then I agree with her.
I don't care what a person thinks they are. But in reality, they are going to be 99.99% chance you are born Male (dick) or Female (pussy). And women are the ones who give birth. There is a rare chance you are both (hermaphrodite I believe) where you are born with both parts. Ok, so if there's one group of people who has a case for having H as an option on a form it's them.
When it comes to standards for sex and gender, there's reasons for it. You can see all the mayhem Lia Thomas has done to women's swimming, but I'll give you another one that applies to everyone.
The classification of being an adult or anything at a certain age. Makes no difference if a country's adult classification for driving or drinking law requires someone to be 18, 19 or 21 etc.... There's a specific age needed to do certain things.
If you think about it? What is age? Why does the government do this? Well because they are thinking if you reach a certain age you are mature enough to do that thing. That's not true. If a city says you can drink booze at 18 or older, who says someone 16 cant handle booze? Who says a 26 year old can? There are drunks getting into car accidents at 56 years old.
But for sake of standards, the government puts a stake in the sand to basically keep life and order going. Just like having someone say they are M or F on a driver's license. You can think what you want, but the formal classification is M or F.
Now someone can say, "I think I'm mature enough at 16 to do things requiring me to be 18". And that can be 100% true. But the gov will say fuck you and wait two more years. Your classification is 16 years old. And no matter what you think or how good you are at controlling beer intake, you aren't 18. You are 16 and not allowed to drink.