The scene is probably more bad taste than racist. I am not too sure the ad agency has worked out who the target market is.
Like Ushiro said, you could have had anyone do that and offend any sub-group. If he had of turning to the male and given him a wink, well....imagine that controversy!
The ad agency I believe were trying to get the message across that the NBL can be seen at home and part of the home. Simple as that. As a society, the bedroom door is normally closed so whenever any scene takes place in the bedroom, eyebrows are raised.
Overall, the advertising industry targets ads to certain markets. With women responsible for most of the household spending, most ads are filmed with women in dominant, responsible positions and the men in support, comic roles. For example, the Foxtel ad where the overweight, submissive male installer asks where the bathroom is. The man of the house misunderstands the question, whereas the "sensible, in control" woman knows what is going on. Ads are more sexist than racist, because most are targeted at women.
You can always tell in an advert who the target market is but the females in the ads. Blonde females means the ad is targeted at men. Brunette females means the ad is targeted at women.
Next ad break check it out.