Jim is kind of an asshole a lot throughout the show, like repeatedly disrespecting Dwight's martial arts and belts as a joke. Disrespecting his wife because she believes in the paranormal and he doesn't. He makes fun of Dwight for being into "fake stuff" but is all about fantasy football. Plop doesn't like sports so Jim immediately says that they have NOTHING in common, like a person's entire worth is wrapped up in what sports they like. He belittles and looks down on everyone, even his bosses, but he has no personality beyond sports and pranks. Jim is a guy I would never get along with in person.