The way people talk is an issue of culture and national origin, not race. That's why xenophobia is a better concept here than racism. But also, the issue here is portraying the Chinese, and by that I mean actual people who live in China, as being happy about stealing American jobs. Had the person portrayed spoken without the accent, it would have undermined the xenophobic message.Welcome to the conservative mind in the year 2012, where ridiculing the way people of a certain race talk in order to demean them is not considered racist.
The ad isn't even logical. It would have made sense to show a Hu Jintao or some high level Chinese official, not an Asian-American girl riding a bike in a rice paddy.