Are You a Jerk?
The scientifically recognized personality categories closest to “jerk” are the “dark triad” of narcissism, Machiavellianism, and psychopathic personality. Narcissists regard themselves as more important than the people around them, which jerks also implicitly or explicitly do. And yet narcissism is not quite jerkitude, since it also involves a desire to be the center of attention, a desire that jerks don’t always have. Machiavellian personalities tend to treat people as tools they can exploit for their own ends, which jerks also do. And yet this too is not quite jerkitude, since Machivellianism involves self-conscious cynicism, while jerks can often be ignorant of their self-serving tendencies. People with psychopathic personalities are selfish and callous, as is the jerk, but they also incline toward impulsive risk-taking, while jerks can be calculating and risk-averse.
via http://nautil.us/issue/54/the-unspoken/how-to-tell-if-youre-a-jerk-rp