Data on the fact that boys are encouraged more than girls to take part in competitive activities (on the whole, so not in reference specifically to soccer and american football), or better yet, trained in some way (sports or non-sports) to be more aggressive in their pursuits.
As an example, a female friend of mine was a gymnast growing up and she was most definitely in an "aggressive", competitive environment. This again is simply an example from my personal sphere which leads me to pose the question as to how such a sweeping statement can be made about the fact that girls are not trained to be aggressive in the sense of competitive, ambitious etc. The limited data set that I am exposed to based on my personal connections indicates no "obvious" bias that you seem to imply exists as a matter of fact.
For clarification, I am not definitely not taking aggressive to mean violent/harmful. We can definitely agree on the fact that that is not a helpful character trait as a founder, so I don't question that this is what the quote is referencing.
As an example, a female friend of mine was a gymnast growing up and she was most definitely in an "aggressive", competitive environment. This again is simply an example from my personal sphere which leads me to pose the question as to how such a sweeping statement can be made about the fact that girls are not trained to be aggressive in the sense of competitive, ambitious etc. The limited data set that I am exposed to based on my personal connections indicates no "obvious" bias that you seem to imply exists as a matter of fact.
For clarification, I am not definitely not taking aggressive to mean violent/harmful. We can definitely agree on the fact that that is not a helpful character trait as a founder, so I don't question that this is what the quote is referencing.