I am really glad you're so proud of yourself, all over a missing cable and a CD, which if you had bothered checking for out in the car park, could have all be sorted in 5 mins in the store.
Thanks to arseholes like you, these stores change policies and often change attitudes in that any customer going back with a return has to jump through so many hoops and made to feel like a troublemaker.
Before you start shouting, "Grow a backbone.", oh I am more than happy to do that on a packed Saturday afternoon just for s**ts'n'giggles if nothing else but some people are not good at confrontation and they need all the help they can get from the law. My Missus will not say boo to a goose and I love nothing more than a bloody good argument on her behalf, as the Apple store staff in Glasgow will attest! Some people like her, may not know they're entitled to certain rights under UK law, don't necessarily have enough knowledge to argue with the intimidating store assistants in big places and they get turned over all because some arsehole like you has made it harder for honest people to deal with these places.