I don't think it is so much the choice of devices, nor the political orientation or sociological explanation, but more along the lines of the financial status of the people you surround yourself with. Having the amount of devices you say you own, and being around the "Art" environment, I am guessing you may be noticing something recently that has been there all along, you may just not have seen it.
Mind you, I am not generalizing that all people who make money, and are into art are snobs, yuppies and jerks, so please don't read into it that way. What you are describing is something I experienced a couple years back, and I pinpointed it down to the choice of the people I worked around and some that I socialized with. We hopefully get to a point in our lives where we are making money, and that can tend to change people. We can now afford toys we couldn't afford a few years earlier, we can now purchase name brands we may not had looked at years ago, and unfortunately I know more than a few people that got caught up into the "keeping up with the Jones' syndrome.
I noticed the more these people got caught up with the quick fix of an expensive purchase, the more they obsessed on having more, bragged about having more, and they suffered a frightening surge of ridiculous materialism and became really hard to be around. The unfortunate side affect of it became an enormous ego, and lack of care for the well being of others, they were too much into themselves.
I started waking up to a lot of the same characteristics in too many people I knew, and I tended keep them at arms length and remain with the people they looked down at, my friends that were there all along. So when the job market crashed, followed by the stock market, followed by the real estate market, as well as an illness, and a couple of bad breakups, I remained who I was, and not surprisingly the friends that were there all along didn't pass judgements on me and helped me go through hard times, I don't know what happened to the "yuppies" they obviously didn't want to "go down with my ship".
As far as dating? It's not fun sometimes, and it sounds like that was a really bad night....and that's ok, you take the good with the bad. But there really isn't a need to classify anyone or groups of people by something as silly as the device they use. I think you may be looking to stick the pinpoint down and put it on the wrong page

You'll figure it out. Just hang in there, be who you are, and find some good people that DO care about the well being of others. I am sure you will find some of them are iPhone users as well.