Some people use trolling ( in this case “Brosnan hate”) to feel important, superior, or in control, especially if they feel overlooked or frustrated in other parts of their own life. Stirring up conflict gives them a sense of relevance.
The posting and obsession with Brosnan usually says more about the person doing it than the person they’re targeting. It’s often a mix of attention seeking, insecurity, and lack of accountability, not anything grounded in reality.