One addition:
The elitist attitude may also have something to do with the inverse relationship between spending time programming and spending time socializing. If all one doing in your days is programming a computer, i.e. telling it what to do, one needn't to utilize the more mamallian soft-logic that goes behind social interactions. So one will start to become a bit dull in those areas, and consequently will start to offend people out of being in 'logic mode.'
I'm sure Mr. Spock had to deal with this all the time and I sure as hell know that many people in my undergrad math department did!
~Kyle
That's a great point!