Well for the US, I would say that we all speak like this 'like OMG! like i like never knew that! like omg!"
and that we are all bush lovers and don't know anything about the world. I support bush but either way...
That were all white... I'm not white...

as for other counties..
china: we all eat dogs and cats.
we sell each other out for money
we're greety (I hate this one!!!)
We have small dicks...
Corrupt, give us 5 bucks and we'll shut up
we are all commie sympathizers... which I am NOT.
mexico: we're all *******s who mow lawns and build stuff (this is litterally what people think, its stupid...)
we are all brown and have black hair, well this may be ture for me, but thats cause i'm only half mexican and half Chinese. my mother is mexican and isbrown with black hair but some people look dead white and you wouldn't be able to tell they are from mexico...
we all play that mariachi stuff at the highest volume posible
We all love FUTBAL (which i do LOL)
that we are all gangbangers...
Filipinos: ( i have family there but they're chinese)
They're all short (which the generally are LOL)
greety
Small dick...
corrupt
a lot of the same stuff from other china