I back in as quickly as most people drive in nose first, with or without the backup camera on one of my vehicles. I always back in because it’s much safer to pull out nose first than tail first, when I don’t know what might be coming.
You have the right to do what you like. I’ll just grumble quietly to myself if you’re doing it in front of me, but that doesn’t harm you, as far as I know.
This Oregon Atny gets it:
http://www.oregoninjurylawyerblog.com/2011/02/could_more_backin_parking_redu.html