I think you are too sensitive about this. If people think about Vietnamese woman at that bad, they would not even give them a try. The thing is they are just trying to avoid those bad girls that you mentioned above.
Further to my above post, I actually did some serious testing on 3bb's different service levels and there is indeed absolutely no difference that I can detect between the different packages. If you pay more for their higher tier packages, you basically get nothing for it as far as I can tell. See this topic: 3bb Premier ADSL vs Standard ADSL