(I'm granting for the sake of the exercise that I'd ask for a drink in the first place, even though in real life I don't consume alcohol.)
Which is precisely why the offered hypothetical is worse than useless in this case.
Bear in mind that in the circumstance being discussed, asking for a drink is like asking someone to hand you $5 -- for no reason at all other than than that you asked, and the fact that they are a male.
To presume that you would react in a certain way, conditional upon first having done something so utterly foreign to you in the first place, is like saying what you'd do if the moon were made of green cheese, only ISTM you'd have a better chance of being right in that case. ;-)
Well, pretend the bar serves something I'd drink. Say I'd get a virgin pina colada. I could imagine asking for one of those.
the fact that they are a male.
I might also ask girls, if the environment gave me high enough priors on them being bi/gay.
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: