I think that I found the answer to your question. I haven't been able
to find the exact quote that you stated but from what I can tell, the
idea behind the quote came from Margaret Atwood.
According to an article found on PBS's website:
'Novelist Margaret Atwood writes that when she asked a male friend why
men feel threatened by women, he answered, "They are afraid women will
laugh at them." When she asked a group of women why they feel
threatened by men, they said, "We're afraid of being killed." '
I also found this at a seperate website:
Why are you afraid of women? I asked a group of men
Were afraid theyll laugh at us, replied the men.
Why are you afraid of men? I asked a group of women
Were afraid theyll kill us, replied the woman.
As you can see, this is essentially the same idea as the previous
quote and your quote.
There is also a book called "Femicide: The Politics of Woman Killing"
by Jill Radford and Diana E.H. Russell that credits this idea to
Atwood, according to this website:
The quote "Men are afraid women will laugh at them. Women are afraid
men will kill them," is also sometimes used by women on banners at
rallies for women's rights.
So, I think that the answer to your question is that Margaret Atwood
is probably the origin of the quote, even though she may not have said
it exactly the way you have it written.
"Margaret Atwood" kill laugh men women
I hope that was what you were looking for.