In European bars or nightclubs, if (relatively) attractive girls ask strangers for drinks or dishes, then it typically means they are doing it professionally.
There is even a special phrase "consume girl" meaning that the girl's job is to lure clueless customers into buying expensive drinks for them for a cut of the profit. The surest sign of being a "consume girl" is that they typically don't consume what they ask for.
It's all about money, and has nothing to do with social games, whatsoever. They are not spoiled brats, but trained for this job.
I am not sure how common is this "profession" in the US, but in Europe it's relatively common.
Sounds like Cabaret Hostesses in Japan. They have male counterparts, too, but the female variety is a lot more common.
Followup to: Do you have High-Functioning Asperger's Syndrome?
LW reader Madbadger uses the metaphor of a GPU and a CPU in a desktop system to think about people with Asperger's Syndrome: general intelligence is like a CPU, being universal but only mediocre at any particular task, whereas the "social coprocessor" brainware in a Neurotypical brain is like a GPU: highly specialized but great at what it does. Neurotypical people are like computers with measly Pentium IV processors, but expensive Radeon HD 4890 GPUs. A High-functioning AS person is an Intel Core i7 Extreme Edition - with on-board graphics!
This analogy also covers the spectrum view of social/empathic abilities, you can think about having a weaker social coprocessor than average if you have some of the tendencies of AS but not others. You can even think of your score on the AQ Test as being like the Tom's Hardware Rating of your Coprocessor. (Lower numbers are better!).
If you lack that powerful social coprocessor, what can you do? Well, you'll have to run your social interactions "in software", i.e. explicitly reason through the complex human social game that most people play without ever really understanding. There are several tricks that a High-functioning AS person can use in this situation: