There seems to be missing a link between depiction of a crime in fictional media and the view of said crime as, in your words, normal behaviour. Media always shows rape as the terrible crime that it is, it reflects how society really views this crime and the perpetrators. If indeed there is a 'rape culture' in reality and reflected in media, it exists in the form of deep seated aversion to the crime and as an almost dehumanizing view on the perpetrators.
That's not what rape culture is.
Here's the thing: in the abstract, you will scarcely find anyone who defends rape. If you ask a man, "Is it OK to rape someone?" almost all of the time he'll say "hell no," because duh. Very, very few people would consciously endorse rape.
But then you start changing words around, don't use the r-word, and all of a sudden men will admit to be willing to do all kinds of things that actually
are rape. Because it seems a lot of men
don't know what rape is. Why don't a lot of guys know this? Because society sends all kinds of mixed messages about rape. The stereotypical view of rape is a stranger in a dark alley snatching a woman off the street, tearing her clothes off, and forcing himself on her.
That is not what most rapes actually are.
It is more often like Brock Turner: a woman in a vulnerable state, unable to consent, maybe not even aware of what is happening, and man who takes advantage of that situation. She can't say "no," so it can't be rape, right?
And maybe she was drunk.
And maybe she was wearing revealing clothes.
And maybe she was by herself at night.
We use all of these reasons (and more) to say it's OK. "She deserved it. It's not rape. She should have known better."
These beliefs are what keep women from going to police. Police mock victims and attack their behavior. So do lawyers. Very few rapists ever face charges, much less see the inside of a prison, because we'd rather give a nice-looking young man the benefit of the doubt, especially if he's being accused by some "drunk slut." And so these guys get away with it, and women don't report. And at the same time, women are bombarded with messages about how they have to protect themselves. Don't go out alone. Don't drink. Don't trust anyone. Basically, don't live your life. Become a complete shut-in, turn your house into a fortress, because the world is full of men out there who will rape you and probably get away with it. And this is somehow women's problem to solve, and somehow
not a sign of a fucked up society that normalizes sexual assault.
That's what "rape culture" is.