But you really don't care about science. Because you are marxist ideologue and not scientist.
Just next time when firemen rescue people trapped in house demand that in 50% cases they rescue men first. Fight this female hurting culture it is 2015 for goodness sake!!! Not that human genome haven't changed in any significant way in the past 10,000 years
Yes. Because they are girls. I don't know what deluded world, or ultra PC world, you live in where boys and girls are the same, or act the same.
The existence of girls that don't scream, and boys that do, despite no difference in nurture is the evidence that it's entirely nature.
It's not absolute "all girls scream", it's simply that more girls than boys do so - much more. And there is nothing whatsoever wrong with that, or with noticing that.
Embrace the differences!
And I would scream like a little girl if I had to be faced with these tree lobsters -- just like I do when faced with flying, giant roaches in godforsaken swampy Georgia.
Give me a big assed spider or snake any day.
You can keep all your conjecture about what wusses little girls are supposed to be. I'm no wuss. Scream like a little girl conveys an evocative image of someone being shrill. The big difference between little girls and little boys is that little girls have the world's permission to express their feelings. Little boys are supposed to "not cry" and shit like that.
Also, while we are having this conversation: The correct interpretation of "Fights like a girl" is "So, they fight dirty?" Have you ever seen a cat fight in junior high? Gebus. Claws in your face and hair being torn out.
FYI: Statistically speaking, if you get into a knife fight with a man, you are highly likely to come away with minor defensive wounds on your arms because men are aggressive and will attack overhanded. Women don't want to cut you. They hold it low down, in a defensive position, and only cut you if you push them into the position of a cornered rat. The result: They gut you or stick it up under your ribs into a vital organ, like your heart. You are much more likely to die from being knifed by a woman than a man.
So maybe you should educate yourself a bit more about what really goes on in this world before you lecture people about promoting gender stereotypes. Because your bias is showing and it isn't pretty at all.
So then you take a step back and stop being so literal (which is also nonsensical because the scream of either young child would suffice in the example) and say "Why is the expression always 'scream like a little girl' vs 'scream like a little boy?" Why would a grown male say 'little girl" and change sexes in their example? It's because we have a stereotype of girls being more fearful and generally inadequate when faced with such things than boys. A small girl screaming is cute and funny because it reinforces stereotypes around them needing protection and not being self sufficient. A small boy screaming is not cute and funny as boy's are expected to be brave and not scared - it's a sign of weakness if they do. It's an inaccurate stereotype and slightly demeans girls and/or sends messages on our how they're supposed to act. "Screamed like a little girl. Throws a ball like a girl" It's death by a thousand little subtle lashes.
So "would scream like a scared little child" conveys perfectly what you might want to get across without demeaning one sex over the other. If you want to be sex specific then use your own vs feeling the need to switch to the other side.