When people complain of the decay of manners they have in mind not the impudent abbreviations of the crowd, but the decline in bowing and scraping and in speaking of one's employer as "the master. " What the rich mean by the good manners of the poor is usually not civility, but servility.
Beatles was 20th-century folksong in the framework of capitalism; they couldn't do anything different if they wanted to communicate within that framework.