This wasn't really meant to answer your political issue, but just to provide a context of what is and isn't socially constructed.
The gender is a social construct argument is the voice that believes the opposite -- that gender roles and expression are learned behavior in our society. Our parents and peers teach us what it means to be a boy or girl from a very young age, and what is socially unacceptable for those genders. (They also commonly teach us, here in the US, that there are only two genders.)
In regards to gender differences I find some of the primate evidence[0][1] rather compelling. This doesn't mean that I believe any gender should be treated differently than the other of course but it seems rather obvious to me that some differences exist outside of any conditioning that human societies may provide.
[0]http://news.nationalgeographic.com/news/2010/09/101220-chimp... [1]http://www.bbc.com/news/av/science-environment-29418230/monk...
This reminds me of colour preference, where girls are more likely to say they like pink than boys and so people conclude pink is for girls and blue is for boys, yet if you ask what their favourite colour is, the top pick for both sexes is blue.
So the evidence on trucks doesn't support the claim you replied to, but maybe they'd be on firmer ground if they said boys had proportionately less interest in stuffed toy animals than trucks.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583786/
It seems the duration shows the same pattern as counting the number of interactions:
"males interacted for a greater total time with wheeled than with plush objects while females did not differ in the duration of interactions with the toy types"
But consider something like the lower representation of women in math. If it happens because of genetically different altitudes/interests then it's inevitable, and there's no use complaining about it. If it's because of society discouraging women, that's just plain dumb.
(Btw: your examples are highly debatable. You can argue that consent and freedom of speech are social practices which respect objective moral/ethical facts).
That's not actually true. Even when something is the expected outcome of certain biological factors, that doesn't make it inevitable. With the right kind of intervention, very little is completely biologically determined. That's what medicine is all about. In many ways, culture is also about overcoming the limits and defaults of human biology. There's no reason to suppose that differences between the sexes can't be influenced into a direction that appears more desirable.
This varies across philosophical traditions. Common-law traditions do, in a sense, hold these sorts of rights as part of the origin story of the universe.
Let's start with this - what is gender?
I know what biological sex is, roughly; I thought gender was a synonym for it(this may be a translation/communication barrier).
From googling the topic, it appears that gender is defined as "the expectations a society places on an individual of a given sex", which makes the "gender is entirely a social construct" statement tautological.
I read about the "blank slate hypothesis", and it seems to be about something else entirely - it seems to be pretty vaguely referring to the "knowledge" and "experience" a human being might have from before they were born vs after. It seems rather naive to be aware of all the other biological differences between men and women but demand that they have no effect on "the mind", or more appropriately, on the expressions of will that a human being exhibits. I'm not an expert though, so maybe there's a deeper truth out there somewhere.