Stupid question from someone not into this sport at all. Why is there a division between men and women in this sport if the thing "actually" competing is a genderless vehicle?

the thing “actually” competing is a genderless vehicle

I don't think this is 100% true though. F1 drivers must be very fit to tolerate ~2 hours of high G forces. I don't think it's out of the realm of possibility that male drivers can tolerate that easier than female drivers.

Unfortunately your argument doesn't hold out. There are something like 5-10% women air force pilots in the US, and I'm sure as hell they can tolerate the Gs if they pilot them, in an otherwise very male dominated industry. Yet F1 sits on a big fat 0 percent. So it's pointless to argue biology when there's a very clear sign that a bigger factor maybe something else at the moment.

firstly, not all Air Force pilots must pull heavy Gs for two hours straight.

Secondly, there are way more than ~30 Air Force pilots, so there is way more opportunity there. Do you think if they hand picked the 30 best fighter pilots any would be women?

lastly, I'm not saying it's ONLY biology, of course there are additional factors involved as well.