Why do some people need constant affirmation?

I also think it is because of self esteem. People who have never been taught to feel good about themselves, seek constant approval from those around them. I call it the "gold star" sytem, like they feel they deserve a gold star for everything they do :) It is very annoying to feel like you must dout upon someone for even the most basic of things. The best way to deal with it is not feed their monster. This doesn't mean to be mean or rude, just don't engage with them.