What is an established law, custom or practice called?

You know that shaw tried to use his plays to promote social messages. you also know that he was a socialist. what is the most likely "moral" of the story concerning the use of language? language should be used to climb the social ladder; literally, it can turn flower girls into duchesses. proper use of language can "declass" the lower classes and them out of "the gutter." proper use of language, including not swearing, is the proud and proper mark of a gentleman. higher classes have a "higher" consciousness and therefore naturally speak better than the lower classes.