Just as the English language has changed quickly in the previous century, so has the use of it. After the British Broadcasting Corporation (BBC) was founded in 1927, the particular style of speech of the BBC announcers was recognized as standard English or Received Pronunciation (RP) English. Now, most people still consider that the pronunciation and delivery of BBC announcers is the clearest and most understandable spoken English. English has had a strong relationship with classes and social positions. However, since the Second World War there has been a clear change of attitude towards speech snobbery , and marks of class distinction  such as styles of speech have been gradually diminishing, especially in the younger generation. By the end of the 1960s, it had become clear that it was not necessary to speak standard English or even correct grammar to become popular, successful and rich. The fashionable speech of the day was no longer the special right of a special class but rather a defiant  expression of classlessness. The greatest single influence of the shaping of the English language in modern times is the American English. Over the last 25 years the English used by many people, particularly by those in the media, advertising and show business, has become more and more mid-Atlantic in style, delivery and accent. In the 1970s, fashion favored careless pronunciation and a language full of jargon, slang and "in" words, a great quantity of which couldn't be understood by the outside world. What is considered modern and fashionable in Britain today is often not the kind of English taught in schools and colleges. What does the author imply by saying "there has been a clear change of attitude towards speech snobbery"?
Everyone speaks English as the BBC announcers do. There has been a great change of attitudes towards the status of English. Most people don't believe the way of speaking by BBC announcers is much better than that of other people. It is necessary to speak standard English with correct grammar.