I'm just looking forward to the day when it doesn't matter the gender of the person taking a role - it is the personality that dictates the role - and there is no comment as to gender - or rather arising specifically because of gender. However that is still a while off yet
We then get into how films reflect the way things really are. As in some ways, I think there are a big variety of people - and some count being masculine or feminine as an important part of who they are and others don't. The problems come when you mix the ones who do and the ones who don't and everyone gets cross because the other one is "breaking the rules".
Incidentally, read several books by Edwin T Hall (I think that was the name, currently wrapped up in a blanket in a cold room and not getting up to go and look along the shelves - couldn't find him on Amazon
) regarding time sense, body language and perceptions of gender in different cultures. Anyway in one of them he commented that the perception of what is proper to a given gender varies between societies. His particular example was that he said that in Arabic culture the woman is perceived as more controlled and possibly cold, and the man more uncontrolled and emotional, which is the flip of the way the genders are expected to behave in UK/US culture.
There are other stereotypes/perceptions in our culture/literature/films regarding colour - Katherine Kerr in her Polar City books has a foreword to the effect that unlike most sf where you can assume if the colour isn't mentioned the person is white, in her books you should assume that if the colour isn't mentioned the person is black. That really struck me when I read it, just hadn't thought of that before. (OK rapidly rambling off topic here so will stop.