not sure what your problem is with living_in_qatar but in the english language it is common to refer to lower class, upper class, middle class, etc.

it is not a statement about their value as human beings but a reference to their income.

living_in_qatar is clearly saying that these punks usually play their pranks with the labourers from asia. i'm not sure why that makes him sick?

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"Even a stopped clock gives the right time twice a day." Withnail & I