I think it's frustrating that people make claims to ideas that they are vaguely aware about. The vagueness can lead to repeating incorrect claims which I think is harmful, especially when discussing sensitive topics.
> Everyone knows that testosterone makes young men orders of magnitude more violent
You're using hyperbole but yes it's commonly understood that there's a link between testosterone and aggression, however you extend that claim to something completely different
> why is it inconceivable that they could also be 4 times more interested in more mechanic play? It’s been observed even in almost newborn chimpanzees for Gods sake.
I counter that this second claim is related to the first, is it that testosterone makes young males more likely to play with mechanical objects? There are a few articles that reference this study from 2008 [1]. It refers to rhesus monkeys not chimpanzees and their hypothesis at the end is much more nuanced
>We offer the hypothesis that toy preferences reflect hormonally influenced behavioral and cognitive biases which are sculpted by social processes into the sex differences seen in monkeys and humans.
Furthermore there is at least 1 meta-analysis from 2017 [2] that highlights
> Gender differences in toy choice exist and appear to be the product of both innate and social forces.
> Despite methodological variation in the choice and number of toys offered, context of testing, and age of child, the consistency in finding sex differences in children's preferences for toys typed
Note they do not make the claim that testosterone is the cause of these differences. Scientists try to be careful about the language they use, we should be just as careful.
1: Sex differences in rhesus monkey toy preferences parallel those of children - https://doi.org/10.1016/j.yhbeh.2008.03.008
2: Sex differences in children's toy preferences: A systematic review, meta‐regression, and meta‐analysis - https://doi.org/10.1002/icd.2064