Why doesn't jack Torrance like stuart ullman?

Jack Torrance dislikes Stuart Ullman primarily due to his feelings of resentment and inadequacy. Ullman represents the authority figure who made the decision to hire Jack as the winter caretaker of the Overlook Hotel, but Jack feels undermined and judged by him. Additionally, Jack's struggles with his own failures and Alcoholism lead him to project his frustrations onto Ullman, viewing him as a symbol of the obstacles in his path to success and redemption. This animosity is further fueled by Jack's growing instability throughout the story.