Maybe the plot is too confusing or the character development is not good. That could be what's wrong.
One popular theme is friendship. Given his role in the story, many fanfics explore his relationships with other characters in terms of deepening friendships. For example, his bond with Thomas might be further developed in a fanfic.
Another aspect could be that in some darker fanfics, if Bruce Wayne were to cross a moral line, perhaps Alfred would have to take more extreme measures. He might cut off Bruce's financial resources related to his vigilante activities. This would force Bruce to re - evaluate his actions and the way he operates as Batman. It's a way of punishing him to make him understand the importance of ethics even in his fight against crime.
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One possible reason could be that Bruce is being too reckless in his Batman activities. Alfred, being the caretaker, might see Bruce endangering himself unnecessarily and decides to punish him to make him more cautious.
Another form of punishment could be emotional. Alfred might give Bruce the cold shoulder, refusing to offer his usual words of wisdom or emotional support. This would make Bruce feel isolated and force him to reflect on his actions.
Friendship is a very common theme. You often see how Alfred and Drummond rely on each other, support each other through tough times.
Love or romance could also be a prevalent theme. Writers may explore the relationship between Alfred and Martha in a romantic light, with all the associated emotions like love, jealousy, and attraction.
One common theme is friendship. Their bond is often explored, like how they support each other through difficult times.
Maybe Alfred is disappointed because Bruce in the fanfic makes some unwise decisions as Batman. For example, he might take excessive risks that could endanger his life or the safety of Gotham in a way that goes against Alfred's advice.
One reason could be Bruce's increasing isolation. Alfred sees Bruce pushing away friends and allies in the fanfic. This makes Alfred disappointed because he knows that Batman needs a support system. Without it, Bruce is more likely to burn out or make hasty decisions that could have been avoided with some input from others.