You are misunderstanding the discrepancy between acknowledging and understanding. Acknowledging means I am fully aware of his opinion and am in terms with the fact that some people do think like that. But why they think like that is beyond me because they're past the point of logical reason.
Okay man, I acknowledge your opinion. However, I do not respect it and you are very obviously wrong. Trying to change your mind from such an extreme depth is going to be nearly impossible.
Rape culture is a thing because the people that believe rape culture is present in these Western developed countries have no idea what that phrase means.