I think feminists are incorrect that a rape culture exists in the United States. More so, they inaccurately understand what culture really means.

Let's start with a reliable source for feminists opinions on what rape culture is http://everydayfeminism.com/2014/03/examples-of-rape-culture/

Mothers who blame girls for posting sexy selfies and leading their sons into sin, instead of talking with their sons about their responsibility for their own sexual expression.

Nothing related to do with rape or sexual assault here...

Calling college students who have the courage to report their rapes liars.

This doesn't in any way promote or view rape as a part of sexual pleasure, nor does it promote the idea that violence against women is part of sex, what most feminists describe as rape culture.

The victimization of hospital patients, especially people with mental health issues and the elderly, by the very people who are there to protect them.

Nothing to do with rape or sex at all....

Twitter hashtags that support accused rapists and blame victims.

There are hashtags that support lynching blacks, and killing jews. This doesn't mean we live in a anti-semitic culture or anit-black culture. Any free society has people with all sort of shitty opinions.

1-in-5 women and 1-in-71 men having reported experiencing rape.

Says nothing about people viewing rape or violence against women as a normal part of sex. There are stats for every crime.

Publicly defending celebrities accused of rape just because they’re celebrities and ignoring or denouncing what the victim has to say.

Believing someone didn't commit a rape is the exact opposite of accepting rape as a typical part of sex and supporting violence against women.

Now, a real example of a rape culture, would be this http://www.bbc.com/news/world-africa-36892963

A man in Malawi was arrested for having forced sex with 100's of underage girls. However, the catch is he was hired by the parents as part of a normal cultural practice for girls to mature:

The BBC's Ed Butler, who covered the story about Malawi's sexual "cleansing practices", says in some remote southern regions of the country it is traditional for girls to be made to have sex with a man after their first menstruation. Some of the girls are as young as 12 years old, he reported.

A statement from the presidential spokesperson no less:

"While we must promote positive cultural values and positive socialisation of our children, the president says harmful cultural and traditional practices cannot be accepted in this country," presidential spokesman Mgeme Kalilani said in a statement

My idea here is, simply making jokes about rape and questioning if someone was truly raped does not mean you have a culture that supports or promotes rape.