When you are a parent, it is your right and duty to change those habits that are forming in your child which can harm him in the long run. But when you are asking a full grown adult to change, to match your sense of being, I find it to be very impolite.
Every adult develops an individuality throughout his life and each action performed by the adult is based on his individuality. The lessons that a person learns from the different life events, shape him. And so it is very indecent to ask an adult to change as per the lessons that you had learnt from your life events. After all, it is healthy to change only when you have an issue with your own behaviour and not to please someone else.