I am above average intelligence and nothing pisses me off more than stupid people (especially stupid people gathering in large numbers). I can withstand nearby gunshots or explosions without emotional stress (I am military), but stupid people proclaiming their awesome wisdom really alters my emotional state.
I had to stop visiting Ars Technica. Their news is great, but I wish I could turn the comments at the bottom completely off. Their comments (really from any news site) are a marvel in the study of stupid people coming together (commonly referred to as an echo chamber).