Why do society wants girls and boys to live in different ways?

Onedayprobably

Basically, how did we even created "guys stuff" and "girl stuff", I find all this pretty dumb, I like to think of humans as "brains in a body" and I also think that every brain have the same possibilities and can think the same things. So why society wants brains that are in different kind of body to also think and live in a different way, like wearing things, liking things etc...

Why do society wants girls and boys to live in different ways?
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