Lived in London for 2 years... worse than Singapore.. full of disgusting Arabs and Pakis. Food, parking cost an arm and a leg. Rents were through the roof.
Bay Area SFO / San Jose - 18 months. Some places are war zones. They station cops to warn you not walk down certain alleys or risk not coming out in one piece. When you live there you don't just see the touristy areas like Pier39. You have to navigate the crime ridden areas to get to business meetings etc.
LA 6 months - same problems as SFO/San Jose but more widespread.
KL. Was there for a month. The crime rate is horrendous. Pollution, congestion, driving all worse than Singapore.
Auckland 8 years - Crime is rampant in the Southern suburbs. Not safe to walk the streets at night. Drug addicts and drunks litter the streets in downtown Auckland. Street corners where hookers hang out at night are littered with used condoms and needles every morning... kids walking to school have to go through the area. You would not want to bring up your kid in this sort of environment.
Singapore is paradise in comparison.
London , New York, etc are full of tourists unlike SG will is full of 3rd world foreign workers. The tourists are transient visitors there to create jobs.SG's 2m foreigners are mainly from 3rd world countries who are here to take away jobs. That's one main difference which you fail to understand.
Another point which you fail to see are Londoners, New Yorkers, just as angry with foreigners which cause congestion, crimes,etc?
A third main point which you do not know is Londoners, New Yoprkers, etc can leave these big cities and live in the suburbs.