Its just in poor taste.
I dont think the makers knew they were being offensive (I think they were like many of the posters on here who just havent lived o/s in a place were this would cause genuine offence), but we live in a globalised world and its pretty bad in many markets (US, UK, Carribean, etc.) to make such an ad.
Having lived in Central London where in the very poor areas they are majority immigrants from the Carribean and African nations, and there are literally fried chicken shops on every single corner (think very downmarket KFC) this would hit a raw nerve. Ditto US, etc.... Cross over to the "safer" parts of town and you'd really struggle to find a single such store anywhere.
Many Australians are not really racist, but boy are we culturally unaware / insensitive of what goes on elsewhere - and what can really offend others!!
Hey Hey's come back skit also springs to mind....