"Sorry non-believers, you’re pretty normal when it comes to being psychologically well-adjusted."

Results of a psychological survey of 1000+ atheists. (Here's a shorter summary article.) The researchers at the University of Tennessee at Chattanooga identify six subtypes:

Intellectual Atheist/Agnostics (IAA)
Activist Atheist/Agnostics (AAA)
Seeker Agnostics (SA)
Antitheists
Non-theists
Ritual Atheist/Agnostics (RAA)

I'd say I'm IAA with a healthy dose of AAA. Maybe a soupçon of Antitheist that rears its ugly head when I haven't had my coffee.

If prejudice continues to exist towards atheists in general, one source may stem from the perceived negative experiences by religious people interacting with a very small sub-segment of the overall population of non-believers, mainly the Anti-Theists. In other words, our research showed over 85% of the non-believers sampled to be more or less your “average Joe” when it came to being “angry, argumentative and dogmatic”, they fall right in line with current societal norms

However, it's true and unsurprising that the Antitheists are more dogmatic, angry, and disagreeable than your average bear.