When I was a little girl, I was taught by my parents to say 'You' (keeping it a bit simpler here) to anyone older or unknown. This meant saying it to my parents, grandparents, teachers and strangers. During my teens I was the last of the three of us (me, brother, sister) to start saying 'you' to my parents. It just didn't feel respectful. And even now I occasionally have problems saying 'you' to people that are older, even when told to do so.
The thing that really bugs me though, is children nowadays. Everyone and their aunt is treated to 'you' in a way that makes me feel really grumpy. What is the problem with teaching children a little respect for other people. Get them to say 'You' first and it can always change to 'you' later.
People who say that everyone is equal and should be treated that way are lying. Not everyone is equal. You don't call the Pope 'Benny', you don't call the President of the US 'George' or the Queen of England 'Betty'. So let's get back to basics: teach your children how to be polite and respectful and I promise you: the world will become a better place!