@Tattie If you are not a parent, your opinions on the difference between boys and girls is uninformed and will almost undoubtedly sound childishly naive to parents, especially cis parents.

(On top of that, you’re wrong: all humans of all ages produce and have testosterone.)

I know the differences are not hormonal but honestly you’re missing the forest for the trees here.

Cis people have education school level understanding of gender. “Boys and girls act differently so it’s testosterone!” is dumb but you are pedantically missing the point being made : boys and girls act differently. To any parent this is observable fact and just saying “your reason is wrong haha!” is not contributing to any form of helpful conversation. It’s just pedantic squabbling.

Again, especially when if they do a basic google search they will see your point is easy to dismiss as factually incorrect.