An interesting question is: does it just reflect reality, or does it shape reality? There are cultures with different ideas about genders - ideas taught to people. So a random book, movie, story, etc you discover in modern west has a higher chance of describing a man murdering a resisting woman. If you see that trope repeated enough times - are you affected in any way? Is there a statistically relevant impact on society as a whole?

I'd say that if there is, then yes, content which keeps the idea alive is sexist to an extent. (Unless you're writing non-fiction) And the existence of the adtech, and ideas like brand awareness, and catchy jingles, and recent fake news is a decent example that society is relatively easy to influence just by constant repeating and enforcing of information.