It's still rape culture and it still feeds into it, regardless of whether nobody actually followed the chant.
As I said, it's a rape joke. Your opinion on rape jokes vis-a-vis rape culture will color your thoughts on that.
Yes, because as we all know, rape jokes are just spiffy. Guess I can go ahead and tell various off-colour jokes about them thievin darkies now, can't I?
The subject of offensive jokes is a sitcky and potentially explosive one.
For the record, I don't think it's possible to say "No one should ever joke about X ever!", X being anything from rape, racism, genocide or death. A good joke can make you laugh
because it's offensive, not in spite of it. Of course, that does mean that you have to be very careful. Every rape joke isn't a good one, and some of them are cheap offensive drivel that should make people react appropriately (by which I mean saying "that's not funny, and you're a horrible person if you think it is.")
But while I agree that there is such a thing as rape culture, I still don't believe humour is the thing that creates or even reinforces it. Humour is also a powerful way to deal with the misery of the world, and offensive jokes, especially among close friends, can be a refreshing way to let your hair down, so to speak.
It's a complex issue, and saying "Rape is something one should never ever joke about! Ever!" is, I feel, not the answer.
All this being said, I'm a rape victim. I understand how horrible an experience it can be, and joking about it has been a way to get over it for me. Banning every mention of rape in jokes would be counter-productive. Once you make a subject taboo, you give it even more power to haunt you.