Good manners are really important in one's social life.Good manners show your friends and partners or mostly people you meet the first time what a person you are.It reveals personal characteristics like if you are respectful,arrogant,or humble.Let us use the example of an interview.A company finds out a lot about you through the way you act,especially in oriental countries.How you behave is so crucial that sometimes they will decide on whether they will take you just based on your manners.
Not not does good manners affect you in business situations but it also helps you to get along with your friends.People always like humble friends.Your manners will also show your social class.If you have good manners people will know that you recieved good education.
Good manners are important in various places as explained above.It really shows how nice and excellent a person you are.