I did not grow up in an atmosphere of machismo (my mother was equal to my dad but neither cared) and we boys were taught to not harass our sisters (and they milked this). I or none of my siblings or friends understand this behavior and are embarrassed by men who exhibit it. How much of this nature and how much nurture? It seems, from the video, it is a cultural issue.
Some guys react to their own testosterone like a junkie on speed. On a sidenote, that photo of those guys pumping iron in their panties is hysterical.