One reason could be that Lupis's actions had negative consequences for Ainz or their associated group. If Lupis's deeds led to losses, whether it was of resources, reputation, or something else, Ainz might yell at her out of anger and disappointment.
In many light novels, characters often have complex relationships. Ainz yelling at Lupis might be related to a power struggle. If Lupis was trying to assert herself in a way that Ainz saw as a threat to his leadership or plans, that could be a reason. Or perhaps Lupis accidentally revealed some secrets that Ainz wanted to keep hidden, and his yelling was a reaction to that.
He might yell because he is startled by the strange things around him in the story.
In some fanfictions, Snape might yell at Draco because he expects more from him. Draco is from a prominent pure - blood family, and Snape, being strict, wants Draco to uphold certain standards. Maybe Draco made a mistake in potions class, or he showed disrespect towards other students. Snape's yelling could also be a way to protect Draco from getting into more serious trouble in the dangerous Hogwarts environment.
In fanfictions, Draco may yell at Harry due to jealousy. Harry is often the center of attention and gets all the glory. Draco, who comes from a proud pure - blood family, might feel overshadowed and this could lead to him yelling in frustration.
Another reason could be related to Peter's mistakes. He may make errors during a mission that put the whole team or the city at risk. Tony, who has a lot of responsibility on his shoulders, might yell at Peter as a way to make him understand the seriousness of his actions and to prevent future mistakes.
Maybe they were really excited or scared and used that name as an expression of their emotions.
It could be that Peter's immaturity showed in a crucial situation. He might have been over - confident and tried something really risky without thinking it through. The Avengers, being more experienced, would be frustrated with his recklessness and thus yell at him. They want him to learn and grow, but his actions might have been too much to tolerate at that moment.
Perhaps it's related to Harry's association with his father, James Potter. Snape had a long - standing grudge against James, and seeing Harry might bring back those bitter memories. So, whenever Harry does something that reminds Snape of James, like being overly confident or a bit of a troublemaker, he yells at him.
In addition to the above, there are other characters like Demiurge. He is highly intelligent and helps Ainz in ruling and strategizing. His devious mind comes in handy when dealing with various threats and political maneuvers in the world of the light novel. And then there's Sebas Tian, who is known for his honor and combat skills, often being sent on important missions by Ainz.
In the manga, Albedo remains steadfast in her allegiance to Ainz. There are no instances of betrayal. The character dynamics are built on trust and loyalty.