killing was business that he did at the orders of his boss. doesn't mean he killed people indiscriminately, or shot anyone who pissed him off. jimmy was a friend of his. in fact he was obviously a very good friend if jules thought he could bring a dead body to his house in the first place. jimmy took it as the ultimate disrespect, and countered with what he knew would be the ultimate disrespect to jules.

my issue isn't really with character motivation, which i get. the scene itself is clever in it's own way. i'm more disturbed by qt's motivation to put this scene there in the first place. i don't believe he was trying to tackle any racial/societal theme. i just think he thought it would be cool. kinda the same way bill maher always acts like he has a pass with some of the shit he says.