Your last point seems like it should be a function of market demands. If people wanted to see women talking about something other than men, those movies should dominate at the box office. Since women buy more movie tickets than men[1] and thus movies will be generally catered towards that demographic, if there is sexism at play here, it seems like it is coming from the female gender themselves which brings up a whole new set of "what's going on here?" questions.
Your last point seems like it should be a function of market demands. If people wanted to see women talking about something other than men, those movies should dominate at the box office.
This is a correct deduction assuming (a) the film industry is a perfect market, that film producers will act as rational actors (how many "take my money" posts do we see?) and (b) that there is no institutional sexism at work in production/distribution etc. I think (a) & (b) are working here, making your "but people don't buy it!" argument false.
randomdata, the invisible hand doesn't seem to have developed such fine-motor control yet, and the media market has the special luxury of manipulating demand to suit its product ("hmm, would addressing real issues, encouraging honest dialog, and fostering fulfillment of folks's true potential ... sell as much popcorn? better not risk it...")
[1] http://womenandhollywood.com/2010/03/11/guess-what-women-buy...