>我以及我5个最要好的朋友分别在Eusoff Hall, PGP, Extension A以及Old KR被老黑半夜三更的粗犷音乐搞的痛不欲生。
Then fight back! There are system and rules. There are hall master and office. There are bullet and guns.

>顺便说一下，我遇到的歧视中国人的一般有两种：一种是新加坡更年期的中年妇女（特别是华人），对中
国人的态度有的时候可以升格到仇视的地步，不知道为什么。有些小老太太一听到中国口音连口气都变了。
How many have u seen? Detail number? How you know they in 更年期？ How come I never seen any.

例外是我们Hall Office的几个中老年妇女，对中国人巨亲切。问寒问暖的。

>另一种是新加坡或马来西亚很重视Activity的人，他们总说中国人不做事，而自己却从来不肯给中国人做事的条件，于是恶性循环，愈演愈烈，最后谁都不开心。
After all you are saying situations in the Hall, and the situation that you experienced. Do you know how many PRC students do perfectly well in hall activities?

>我其实不介意被印度人歧视，因为黑人和我们隔阂太大，不知着不怪，
但我最讨厌的是华人歧视中国人，还口口声声的说华人不是中国人，华语不是中国话，怒~
That's correct. They have every reason to say so, cos they are not.
btw you should realise the cultural difference and try to find your position to fit well, but not to hate another culture.