I think the topic of sexism is in some ways overrated. The working world in North America at least, is far less interested in gender and more interested in money.
I think assumptions are more often a result of stupidity than sexism. And I would also add that when there is a low level of communication, more misunderstandings and ignorance occurs. For progress there has to be more open dialogue, both ways, and hopefully without judgment. But that's not always going to happen.
It's ultimately biology, evolution, and survival that dictates current gender roles (even if it's now changing more). So today's values still exist within an evolutionary context.
I grew up having mostly female teachers, and they bashed men often. I never had a male teacher bash women. I never experienced that. Then in university, there are women's studies, women's issues, women's rights. Never a course on men. So opening the dialogue to include and understand everyone is important for progress. In the meantime, all the media is going to do, is capitalize on whatever the values are of the day.