Let’s face it, good manners are important. Many of us tend to get annoyed if someone does not give us common courtesy, like holding a door open or saying “thank you” when you do something for another person.
In fact, when I was an elementary school teacher, I would often tell my class that if they were to go out on a business lunch for a job interview, and the job was between two people who had the same qualifications, the person with the best manners would get the job.
Because when that person would take a potential client out for lunch or dinner, s/he would not embarrass the company by reaching across the table or speaking with her mouth full.
Children need to learn manners. Here is an article on how your troop can earn the Brownie Girl Scout Manners Try It badge.