Whats wrong with the PRC? It help keeps cost low for everyone and they get to retire back home with their pay when the times comes. PAP call it a "win-win" situation.
Whats wrong with not closing the door? You have never seen it before? You are too ashamed of your own body? Why can't they keep it open? There is no law that says they can't? Its in the toilet, only females will see it. Plus lesbianism is encouraged in the country as well. Singaporeans have been taught this and that without thinking of alternatives for a long time. Maybe you should see it as an opportunity to view thinks differently.
I wouldn't go so far as most Singaporean converse in English or are used to it. Singaporean converse in SINGLISH, pidgins of Hokkiens, malay, weird accent mixed together with no coherent structure to "non-native" speakers. Do you expect anyone to assimilate to a culture that have no official support from the government? I myself, prefer Mandarin, Hokkien, what ever their native speaking tongue is when the opportunity arise. Perhaps this video should clue you on why they hate Singaporeans so much as well. If you can't understand perhaps you need to learn some Mandarin yourself.
PAP has no problem letting in more PRCs, they have their work cut out convincing idiots that believe things can be solve with a brush of stroke.