Kong Zi said something similar :
己所不欲，勿施于人
What you do not want done to yourself, do not do to others

So whoever said that is ignorant of its own cultural gold canon.

I'm not surprised. Somehow, for many, there's this idea that you've got to get in first - to rip someone off, to take advantage, whatever - before they do that to you.

This girl either told you, on behalf of 1.3 billion people, that people cannot understand basic respect and to treat others well, thus being a bit, shall we say, slow. Or she told you that she thinks Chinese are somehow different than others. 

I'd walk away and never talk to her again. Ever... oh, is she hot then maybe. 

Never do today that which can be put off until tomorrow.

For the Chinese here, it literally means this: Do if there are benefits for the doer and if the benefits are huge, do more. So when your Chinese friend says " Chinese can't do it. It doesn't apply to us" , she didn't tell you the whole story. 

I thought the "Golden Rule" was: He who has the gold, makes the rules.

The Chinese interpretation of a win-win situation is a situation where one side wins everything. 

Newtons third law of motion? Nope, doesn't apply to China, we're ~special~

The irony is that the Chinese articulated this long before Jesus:

"Never impose on others what you would not choose for yourself." – Confucius

"Regard your neighbor's gain as your own gain, and your neighbor's loss as your own loss." –Laozi

Don't forget
"Go Communisim!" - Confucius

Part of that applies to Chinese, ''Do unto others" As soon as gold is mentioned, then it becomes ''gimme''