Literal Interpretation of Loving Your Neighbor

Hey, dummy! The joke here is that the priest tells people to love their neighbor just as much as they love themselves. The guy in the car hates himself so much that when he sees his neighbor, he just calls her all sorts of bad names. It's funny because he thinks he's following the rule perfectly, by treating her exactly how he treats himself. You probably think this is just a normal conversation, don't you?