If a band (acoustic or otherwise) has lot of energy, and so does my partner, I am likely to end up pulling out lots of flourishes and have several pulled out on me; speaking for myself, I am as likely to be dipped in the midst of a set by Nor'easter (who are awesome and acoustic) as I am in a set by Perpetual e-Motion (who are awesome and use electronic instruments) as I am in a set by dJ improper.
While I might see a somewhat higher concentration of swingy, flourishy dancers at techno contra events, I'm not sure that the techno contra scene is the only attraction for them -- I danced with several of these people before crossover contra gained its current momentum. Personally, I find that my partners influence my dancing in the moment more immediately than the music does -- don't get me wrong, I fully recognize that the music informs my partners' and my movements, and we wouldn't be there to dance without the music -- but my conscious concentration at any moment on the floor is mostly on my partner or my neighbor. If the music has lots of energy (whether or not it has a thumping bass line), the dancers will have energy -- to my mind, this is not exclusively the domain of crossover contra.
If partners and neighbors come at me with lots of swingy moves (or if I know they like flourishes), I will react accordingly. If they like to dance the dance as written or I'm on a floor with a lot of unknown (to me) quantities, techno or traditional, I'll dance the dance more as written. In other words, I see some correlation, but I'm not sure I see the causation that Ray did. Maybe my experience is unique, but I'm not so sure.
So, dancers, do you dance differently to different bands, acoustic or otherwise? Do you find that you do more flourishes to Wild Asparagus, or the Syncopaths, or Double Apex? If you do, what changes for you? Sound off in the comments!