Why is Singapore called booger country?

First, because Singapore is a country with a small land and a large population.

Second, because Singapore is a country that practices high-pressure control, it is not a truly civilized country. Many minor violations will be punished with high fines or hard labor. It is one of the few countries that practise flogging. Many illegal crimes will be flogged, such as illegal immigration, rape, robbery, drug trafficking, extortion, illegal possession of weapons and daggers, wounding, graffiti, gathering people to make trouble and so on. Whipping is a cruel punishment, which does great harm to human body, mind and spirit. Whipping can cause pain in the buttocks and leave a permanent scar.

So Singapore is a veritable booger country.