Is because women can have children and men can't?
Yes.
Men certainly don't hate us because we aren't as strong, physically. (And they lie about the contributions to society.)
Take a look at other people hated by the white men in power:
Black men aren't physically weaker than white men. Indeed, they and black women were (and to some extent still are) stereotyped as, if anything, physically stronger by the white men exploiting their labour. Black women were considered plenty strong enough to do hard physical work while white women of the upper class were locked away and forbidden from even riding a bike for fear it might damage their uterus - or that's what men claimed it was about.
So, it is that the white man despises others because they are not as clever as him?
We only need to look at the average playground where a boy is bullied because he works too hard for school. (They'll still want to copy his homework, though)
Man hates what he envies and what he wants to exploit.
Excuses will be found as to why those he wants to take advantage of do not deserve better, but they will be no more than excuses, and he will work hard to keep the illusion.
Women are prevented from leaving the house, then blamed for "not contributing to society", not allowed to get education, then called stupid, not allowed to do any sport whatsoever, then called weak.
Slaves were not allowed to attend schools or learn anything, in order to uphold the illusion that they were inherently stupid.
Trying to prove to men that we are strong, that we are clever, that we are worthy of being treated as human, is futile.
They know all this only too well.
White man lost interest in exploiting black people's labour when science meant that machines were cheaper, anyway.
Interest in exploiting women's reproduction, too, decreased when not so many workers were needed anymore.
We like to think slavery was abolished and women's rights were recognized because we worked so hard for it and because men became better people - but ultimately, there is no proof for that.
There is, however, plenty reason to suspect that most of societal change occurred because exploitation wasn't as profitable anymore.
So, yeah, sorry, there is no hope to make men see that we are human and then, as if some switch was flipped, they will treat us with respect.
They will treat us with respect as long as they don't lose too much by doing so.
Men were happy to let some women have jobs as long as most women were still forced to be sexually available to men in order to survive. (Men were especially happy to do this when there was a surplus of women after the war)
Now that lots of women have jobs, and many decide to not be sexually available to men, there's a backclash, and it is all about enforcing male access to women. Porn, Prostitution, taking away women's privacy in hospitals, shelters and prisons.