Not a rule, but a norm. It's really a matter of point of view.
Also I'm fairly certain that the aggressiveness in males is intended primarily for mating. I can cite a source if needed.
When you get right down to it, a norm and a probability are really the same thing.
When something is "normal," all that means is that it's generally the most likely outcome. In other words, a higher probability.
People have different levels of aggression and all sorts of other emotions and tenancies solely based on this probability due to very complex, interwinding causes things like conditions in the womb, brain chemistry, genetics, conditions during infancy and early childhood, brain structure, and so on.
It isn't some sort of trick or masking/internalizing of your "male aggression," people genuinely fall out of norms based on how their bodies physically
work. Instincts don't dominate the human mind like they may once have in the past anymore. And this is what's happened with people who have gender dysphoria, they've fallen so far outside the norm by sheer luck of the draw that their brain is wired to be uncomfortable with how they are. It's not a simple condition of course, but that's the gist of it.
Poll