We have the same thing here in the UK, but our underclass (yes I know how that sounds, but technically it's true) runs along the lines of what we call chavs and pikeys. Both chavs and pikeys proudly wear their uneducated, lowest-working-class. welfare-grabbing, 'don't care, you can kiss my arse' attitudes on their sleeves.
Pikeys live in wheeled trailers or vans and are found in the countryside. They wipe their noses on their sleeves with a loud snort, never wash their hair or clothes, thieve from shops and washing lines (yes steal the drying clothes off them!), don't know how to speak properly, hold their fork in their fist like a baby does, drink constantly, pick dog-ends (left over cigarette bits) off the sidewalk and re-assemble 7 or 8 of them into one 'new' cigarette -- that sort of thing. And other pikey families have to conform to that conduct. Well at least you don't have to worry about them smacking gum because they don't know what gum is (unless they stole it from the newsagent shop).
Chavs are the urban or suburban equivalent. Loud, brash, violent baseball-cap-and-cheap-gold-neckchain-wearing football (English soccer) fans. The men shave their bullet-shaped heads (good for fighting), get tattoos, and are full of attitude. The hard-faced girls pull their hair back into tight ponytails, wear huge cheap hoop earrings, a ton of eye makeup, and are even rougher than the men. They shoplift for kicks. They all drink constantly and end up in street brawls. They live in council houses (housing projects) and hang around street corners and bad pubs all day. They talk like they have marbles in their mouths and they are the grand champions of gum-smacking and open-mouth chewing-with-attitude.
And both of these groups think anyone else on the planet with an ounce of intelligence or manners is either a 'poof' or is 'up themselves'.
But not even a pikey or a chav would suck food off their fingers! That's not even human.
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"The death of creativity is a pram in the hallway"
- Cyril Connolly