First part of that video is up Whetstone, North Finchley way where I'm from. Hopefully they spend more time in Brighton so I don't encounter them on the road!
Aside from this, the rider is a girl, and has suggested in other videos that they are trans.
http://www.youtube.com/user/tritriplekylie/about
Criticise their riding and attitude all you want, but do bear in mind that trans- people are amongst the most likely amongst minorities to get murdered in the west, just for being who they are, and they have enough else to deal with in their lives that casually deriding them for it, or intentionally misgendering them is bloody horrible and totally unnecessary. Please don't do that.