Yep - lots of stupid gun owners with immature personalities out there. I consider it my responsibility to stay out of any kind of spat that might escalate - arguing opens the door to being "dissed", which too many consider to be "just cause". I'm willing to be dissed and take verbal abuse if it means a situation won't escalate to a physical confrontation.
Rational people who carry a gun do so for self-defense. Idiots like Dunn carry one so that they feel brave enough to initiate conflicts whenever they feel annoyed at someone or something.