Players differentiate between healthy competition and detrimental rivalry at the casino by assessing the emotional and behavioral impact of the interactions. Healthy competition fosters enjoyment, friendly banter, and a focus on improving skills without hostility, while detrimental rivalry often leads to heightened tension, aggressive behavior, or a fixation on outdoing others at any cost. When competition turns into a source of stress or leads to reckless betting and poor decision-making, it becomes detrimental.