I've seen a fair amount of arrogance on both sides, though for different reasons. There have been plenty of theist threads that were blatantly intended just to rile the rest of us up or to lash out. Like this one, for instance. The truth is that both sides can sound pretty arrogant to one another much of the time. Half the time we can't even agree on simple things like terminology, science, or the state of recorded history.
Still, this forum is--in my experience--better than most where the two factions mix. I am here because I want to hear from people who don't always see things as I do, but who know something of my experiences. Perhaps both sides could cut down on the knock-the-chip-off-my-shoulder threads and we can all enjoy ourselves a little more in here. The best of us never intentionally start such threads in the first place, whether it be under the guise of reasonable discourse or other blatantly "you arrogant bunch of jerks" kinda threads. The other problem is that this isn't a very good means of communication. The voice and tone we hear in our heads as we read these posts may not be the one intended. I've got into plenty of trouble over that one myself. Some on both sides may seem condescending when we're really just being matter of fact. Believe it or not, it does happen and quite a lot.
But even if it doesn't improve in here, I'll keep hanging around. It's simply the best thing going. So long as it doesn't degenerate into a constant series of flame wars and angry debates, which I've seen elsewhere. Blowing off steam is understandable, but be happy you found this place, too.