@OkamiLeek006 The reason we have gendered roles is because of our dimorphism.
Around 9-10 is when puberty starts, so it makes sense that it would be an age where boys become aware of the different kinds of affection. It also makes sense for slow developing children to be corrected so that they are not displaying unintentionally overly affectionate behaviour.
Male affection is not a sign of weakness, but often has connotations of intimacy. Intimacy isn't weakness, but it does imply sexual attraction and partnering.
As an aside, combat requires emotions. The major thing militaries try to instil in servicemembers, other than hierarchy and obedience, is violence of action. That is a requirement of being deadly, and is a controlled burst of emotion. Killing humans is absolutely an evolved trait too, human history throughout the world has lead to those with the willingness and capacity for violence rising to the top. That is simple positive selection. If you cannot protect your women and children, your lineage ends with you.
Women, particularly pregnant women, do have "nesting" and "nursing" impulses. That is also a positively selected trait as both behaviours benefit rearing infants.
All gendered roles have some basis in biology, because all behaviour is slave to it. That isn't to say that all behaviours are pre-programmed or pre-determined, but our relative propensities for certain types of behaviour are consistent across cultures.
It also isn't to say that behaving outside those gendered bounds is detrimental or to be frowned upon, just as we shouldn't mistreat someone for having a low IQ or having enormous feet.