I don't think this is akin to 'locker room banter' at all, personally. Well, perhaps some of it is - and no there isn't a problem with groups of men (or women, for that matter) talking explicitly about others in private, but some of the remarks he makes in this video go way beyond that.
He has basically admitted to sexually assaulting women, and believing that he can (and does) get away with it because of his wealth and status. Sure, there are always going to be both women and men who succumb to such things in their quest for capital or power, that's par for the course - but it's also important to acknowledge that a lot of these people are being exploited in the process. It works both ways, Trump and other people of a similar status use and abuse others because they've inherited a sense of authority that they believe put them beyond the law and the boundaries of acceptable conduct. Many of these women will be in positions where they don't speak out or feel scared to purely because of who they're dealing with - I mean you only have to look at the abuse uncovered by Yewtree to see that in action. People don't speak up because they feel like they won't be listened to or won't be believed. It's just another toxic attitude that comes with extraordinary wealth, as if we needed another reason to oppose such a thing
It's also worth pointing out that not all men (and not all women) engage in discussions like this. What an outdated notion