Do you consider people closed-minded that don't believe in extraterrestrial life?

[Serious_frusting]

I think it would be arrogant of anyone to be so self-indulgent enough to believe that earth is the only place in the entire universe that can sustain life. 

Life can be anything from just a small piece of bacteria. For someone to say not even something as small as that could possibly exist outside of the confides of earth, when they know how small we actually are in the grand scheme of things is baffling.  

I think when you mention aliens to the average joe they get these images in their heads

With these images in mind you can understand why someone wouldnt believe in aliens.