Good manners are so important in today's society. A little effort of  being polite to everyone you meet can have great rewards. Of course there are other reasons for being polite as well. Everyone should be polite. Polite people show good manners. Moreover, they are popular. On the other hand, rude people are looked down upon. Rudeness shows poor education. Therefore, why not be polite? A simple "Please", "Thank you" or " You are welcome" can make a big difference. If someone says dirty words all the time, it shows that something is wrong with his mouth. You'd better persuade him to watch his mouth.