"Women are meant to be loved, not to be understood." -- Oscar Wilde
But to the extent that it is true that men do not understand women, it follows that if a man attempts to write a story from a woman's point of view but is totally off-base due to gender-wide ignorance of women, that any other man reading it will be just as ignorant and so not see any problem. So only half the potential readers will find the story incongruous. :-)
Seriously, though, I've read stories written by women where the men all seemed "off" to me. Some where the men act like women, and some where the men are extreme stereotypes. (Like, I've seen a few movies on Lifetime Network. Men are either controlling, abusive jerks, or sweet, sensitive, caring wusses.) So I don't doubt that men sometimes write female characters that women find unbelievable. I've certainly read stories where the women act just like men. A large percentage of action-adventure stories fall in this category.
Of course it's not like all men do Y and never do X while all women do X and never do Y, so that you could take one scene out of a story and say, "What? That's something a man would do, not a woman." Still, anyone who has actually interacted with real men and women knows that the two think and act differently in many ways.
I'm reminded of some cartoon my kids watched once where a pre-teen boy asks his sister or whoever she was supposed to be what he should do to "become a man". She fumbles a little, then says, "Well first, no matter what, don't let anyone else touch the remove control." "I don't know about that," he replies, "I feel like ..." And she slaps her hand against her face and cries, "And don't talk about your feelings!"
IMHO, the ultimate sexism is the idea that a woman is only praise-worthy to the extent that she acts just like a man.
But surely it's the same problem an author faces any time he attempts to write a character who is not exactly like himself. I'm sure that rich people stumble when writing poor characters, Americans stumble when writing Chinese, Christians stumble when writing atheists, liberals stumble when writing conservatives, etc etc, and vice versa.
I can think of many examples where the writer either portrayed a character as being just like himself when he clearly wasn't, or when the character was such a stereotype or caricature that it was laughable.