Treating someone with scorn or disdain because that person is alwalys at fault, is never the best. Using the rod everyday without onday settling down to use advice will never make change from the person you are refering to. Sometimes people acts stubborn even after being cautioned because they don't understand the value you hold for them or maybe they think you will stay forever. Call them, talk to them to their faces and say, " you will leave us soon".
People take you for granted maybe because they think you will stay forever - but once you leave, the vacuum you will create will be very hard to be covered or replaced. That's why we need to make our selves to feel important or wanted.