I from the US, just learned about these today, and had a chuckle.
an essex girl was driving down the A13 when her car phone rang. it was her boyfriend, urgently warning her “treacle, i just heard on the news that theres a car going the wrong way on the A13. please be careful!” “its not just one car!” said the essex girl “theres hundreds of them!”
I wouldn’t go that far, there’s not a snobbishness associated with Essex people that I imagine there is with Beverly Hills (though I’ve never been to Beverly Hills). There is classism in the stereotype but people from Essex are generally looked down upon, not (so much) the other way round.