I'm wondering if the dreaded word 'taste' comes into the definition of chav behaviour, speech and appearance. While admitting that no-one has the right to decide what is or isn't 'in good taste', I think we all generally have a rough idea of tasteful/tasteless. This sounds terribly snobbish, but when someone/something is described as 'tacky' we all know what is meant. Society itself seems to influence these standards of public behaviour, not individuals, and interestingly, they are changing and evolving all the time. 'Tacky' now could be 'desirable' in a decade or less. Even Estuary English is becoming quite the thing!