"Wrapped inside this little word is the quintessence of Britain's great social fracture. Over the last 30 years the public monstering of a huge slice of the population by luckier, better-paid people has become commonplace. This is language from the Edwardian era of unbridled snobbery. When safely reproduced in Downton Abbey, as the lady sneering at the scullery maid or the landowner bullying his workers, we are encouraged to look back smugly as if these shocking class differences were long gone. The form and style may have changed – but the reality of extreme inequality and self-confident class contempt is back...
Chav is used to mix together anyone of low status the speaker wishes to despise - and that includes the entire working class - on matters of taste as well as morals. Just go to the dreadful ChavTowns site and see how the two are elided."
Polly is so far off the truth you wonder if her ignorance is deliberate. She hears some posh person (in this case a Lib Dem politico tweeting unwisely) using the term and conjures up a conspiracy to demonise an entire working class.
The contributors to ChavTowns are overwhelmingly themselves working class people (and by the spelling and grammar, people who have been failed by our comprehensive system).
Working class people detest the chav/underclass far more than middle or upper-middle class people do, because they live among them and are exposed to their behaviour on a daily basis. That's why the contributions to ChavTowns are so bitter, angry and heartfelt.