such immature people that openly mock someone should be busted by the cops or sent out to some kindergarten.
it's not about hairloss anymore , I wouldn't laugh at anybody about their condition , you'll only get the person more embarrassed and self-conscious than ever, you're killing him from the inside , maybe leading him to depression by dint of being a cheap jerk like that.
those two on the video are one hell of a cheeky pair , her face should have been concealed on the video , acting like this is a disgrace , not something that you'd be boasting about.
I saw something similar with someone following a hunchback throughout a mall , and making a video especially to mock him through disparaging comments (without him noticing).
youtube should just remove such rubbish.