First of all, let us clearly define rape culture:
Rape culture is a sociological concept used to describe a setting in which rape is pervasive and normalized due to societal attitudes about gender and sexuality.[1][2] Behaviors commonly associated with rape culture include victim blaming, slut-shaming, sexual objectification, trivializing rape, denial of widespread rape, refusing to acknowledge the harm caused by some forms of sexual violence, or some combination of these.[3][4] The notion of rape culture has been used to describe and explain behavior within social groups, including prison rape and in conflict areas where war rape is used as psychological warfare. Entire societies have been alleged to be rape cultures.[5][6][7][8][9]
https://en.m.wikipedia.org/wiki/Rape_cultureSo, now we ask ourselves if western societies fit this definition.
First, is rape pervasive in western society? That depends. In some places, yes. And for women of colour, this is also more likely. So let us say sexual assault is pervasive in some places and for some people.
Second, is sexual assault normalised? Well, if sexual assault is normalised through victim blaming, slut-shaming, sexual objectification, trivializing rape, denial of widespread rape, refusing to acknowledge the harm caused by some forms of sexual violence, or some combination of these, then yes, it is normalised. There is even evidence of this on this very forum.