This is precisely why I like Horde better. There are less douchebags. Yes, Horde has plenty on their own, no doubt, but since there's less Horde as a whole, it's less likely you'll run into one of these said idiots.
There is one drawback to Horde, though. While there are less stupid people, there are a larger percentage of assholes. So, for me, it's always a choice of being with a stupid person, or being with someone that has an ego the size of a large city. (Though, this may also just be a result of the servers I rolled on.)
Out of curiousity, was he a warrior? This may be just strange coincidence, but generally, the stupid people I run into tend to be warriors.