This seems like a good time to address the "t-word": TESTOSTERONE.
I have seen mention in this thread and other places the idea that I am a boy/man because when I was born, a doctor observed my genitals and declared "it's a boy!" and by implication I was socialized to behave as a male in society because of this declaration when perhaps if left to my own devices I would have behaved differently. This is my understanding of the idea and may not be wholly correct. I certainly acknowledge the reality in which some behavior is shaped and influenced to varying degrees by the people around us and society at large.
As an aside, not everyone is born in a hospital. Especially if we are talking worldwide and not just the US.
As a biological male who identifies strongly as male and always has, I would assert that the much greater reason for this than a doctor looking at my junk and saying some words is the fact that I was flooded with testosterone in the womb and when I went thru puberty my testicles began producing large amounts of testosterone, and this hasn't stopped even to this day at the age of 44 (yes I've had my levels checked).
When humans compete with one another, many factors contribute to who ends up being victorious. It is my assertion that the most relevant factor in competition is testosterone. We can talk about society and environment and how expectations shape behavior and all of that. What we can't do is point to a biological female world chess champion, or a biological female who is the best poker player in the world (there are certainly many top biological female chess players and poker players, of course).
We are not going to see a biological female world chess champion, and we are not going to see a biological female become the best in the world at poker. (In fact, in the history of the World Series of Poker I think a woman has only made the Main Event final table once, and the WSOP ME Champ isn't necessarily considered the best player in the world).
There will never be a biological female Bobby Fischer or Garry Kasparov because biological females cannot produce enough testosterone to defeat top biological male players. This is not my opinion - it is the reality.
I've also heard a few different places that someone's friend who is trans and is taking testosterone "has more testosterone than a biological male." Yeah, the weak girly men perhaps.
There is no crossover in testosterone levels between biological males and biological females. Assuming everyone is healthy with respect to their endocrine systems, the biological males who make the least testosterone will have exponentially higher levels than the biological females who make the most testosterone.
Testosterone levels for biological males are wide: something like between 250 ng/dl and 1000 ng/dl. A biological female who supplements testosterone to produce levels at the upper end of the normal biological male range is going to experience harmful side effects. Whereas biological males at the upper end will not because their bodies are naturally producing large amounts of testosterone.
So a biological female can take all the testosterone she wants and she will never have as much in her bloodstream on a consistent basis as I do, and the high levels are good for my health and bad for hers.
P.S. I think saying "biological males are stronger than biological females" is not specific enough. There are absolutely ways in which biological females are stronger than biological males. For example, there was a 250 mile footrace and a biological female won the race by 10 hours. Also, I am not a scientist but it is my understanding that biological females have stronger blood-brain barriers than biological males.
What does any of this have to do with the subject of this thread?