Psychology Today has a pretty accurate description for these two especially the Captain of the Eighteen Wheels:
So why do wisecrackers keep their bons mots coming at the risk of alienating others? Though they may not be aware of it, sarcasm is their means of indirectly expressing aggression toward others and insecurity about themselves. Wrapping their thoughts in a joke shields them from the vulnerability that comes with directly putting one's opinions out there. "Sarcastic people protect themselves by only letting the world see a superficial part of who they are," says Steven Stosny, a Washington, D.C.-based therapist and anger specialist. "They're very into impression management."
http://www.psychologytoday.com/rss/pto-2...00002.html
So why do wisecrackers keep their bons mots coming at the risk of alienating others? Though they may not be aware of it, sarcasm is their means of indirectly expressing aggression toward others and insecurity about themselves. Wrapping their thoughts in a joke shields them from the vulnerability that comes with directly putting one's opinions out there. "Sarcastic people protect themselves by only letting the world see a superficial part of who they are," says Steven Stosny, a Washington, D.C.-based therapist and anger specialist. "They're very into impression management."
http://www.psychologytoday.com/rss/pto-2...00002.html