Manners are really important to live a smooth life. Many will admire those people who are so rescpectful, disciplines and considerate. We need to evaluate ourselves so that we will know if we are good enough.
I have encountered different kinds of people. I have seen those people who are so sensitive yes not sensitive when they are the one discriminating someone. It is better to observe others but observe your ownself first so that you will know what are the things you will not like and in return try to avoid not doing it. Have a self check always.