Translation help!

I don't understand the context of this sentence can someone please help?

我在美国的中文老师常说中国人都是这样的，中国都是那样。

Translated, it says... [Under the tutelage of] a Chinese teacher in the US, [or simply, "My Chinese teacher in the US..."]he often says that Mainlanders are this way while China is another [/that] way.  

I see no context surrounding this sentence and so I don't know what he is referring to.

Translation help! 

我在美国的中文老师常说中国人都是这样的，中国都是那样。

     My Chinese teacher in the US often says that Chinese people  are all look the same in style,and they are all the same in China.

      这是我竭尽所能协助你翻译的，请不要见怪，如果我翻译得有所疏漏，或者尚且对英文还有不甚熟悉和运用自然的方面，请不要责怪，我是中国公民，这是我凭借我的母语水平和微乎其微的英文技巧来翻译的，如果不能够让你满意，还请包涵啊。谢谢！