Well hang on. It isn't that simple. The man buying the woman a drink is more or less the courtship norm. They haven't actually stepped that far out of line by asking for a drink so the way you respond has to be calibrated to their status. If their status isn't that high and it was something of a gutsy move to ask for one, there is nothing wrong with letting them down softly with a "Nope. It isn't anything personal, you seem cool. I just don't buy drinks for women I just met" and you can segue into a conversation about how silly the norm is if you like. If the person has really high status then something more along the lines of lightly mocking them for being a spoiled brat who won't buy their own drinks can go over fine.
If the person has really high status then something more along the lines of lightly mocking them for being a spoiled brat who won't buy their own drinks can go over fine.
Is this speculation or have you tried it?
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: