I know ALL about body conditioning, it what I teach best. there's a difference between conditioning and humiliation!
If I thought a given student would feel humiliated by the belt whipping ritual, then I would absolutely not support putting the student through it.
On the other hand, I don't know that I've encountered any BJJ students at the blue belt level or higher who would feel humiliated or hazed by the ritual. (Blue belt is the earliest anyone would go through it.)
As I mentioned, the discomfort is trivial compared to the discomforts involved in earning the belt in the first place. There's no ill-will coming from the other participants, so I'm not sure where the feeling of humiliation would be coming from.
I'm not advocating for the ritual. As I said, I consider it kind of pointless and we don't practice it at my current gym. Nevertheless, I think you're projecting an emotional reaction onto the ritual that the actual people who go through it do not experience.