Some people are indeed very demanding. They may be demanding of time, of attention, of appreciation, of gifts, etc. It may be that they need reassurance. It may be that they are greedy. Or, they may just be hyper people who need a lot of attention.
There are those who enjoy meeting endless demands. There are others who find it tiring and tiresome.

It is unlikely that someone is going to change his or her nature. So the code may only be useful at moments of great 'demand' as a sort of reminder. As with 'possessiveness', people are not usually aware they are 'demanding'. So a simple form of reminder has its value.