Still, even among women of the same race, the muscle and bone structure difference exist.
This is true but the differences between biological men and women go much further than mere muscle mass and bone density/structure. They are such that even the best women athletes in the world would never be able to beat even an average male athlete. In most cases the best women can't even beat male high-school athletes. That's just how it is.
We are equal but being equal doesn't mean we're the same.
People born as biological males don't just have greater muscle mass, but a different muscle composition, allowing for greater strength and speed. They have bigger hearts, bigger lungs, a different body shape, including differently shaped hips. It all increases their speed and overall power.
I also think that it's important to not forget about the other young women who are the competitors, because they matter too.
These girls must've trained from a very young age hoping to one day be the best in their sport. They probably trained as much as 5 days a week only to then be made to race someone who they could not reasonably be expected to beat. They must've gone into these races knowing that the best they could hope for was to be second best.
Respect is important, support is important, but it cannot come at the expense of other women. And from what I understand, college sport in the US is not like school sport in other countries. It can decide someone's future so I'm not surprised that there's a huge debate.