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This trope is quite common when characters suffer from a Ron the Death Eater portrayal. Writers will often have such characters do misdeeds for the purpose of hammering home the fact that they're meant to be the villain, regardless of whether they're in character or relevant to the story.
In Nobody Dies, Claire Makinami calls Mari, her own daughter who was already going through identity/morality issues because the second Ramiel fight has made her half-angel, a monster to her face.
In thisKatawa Shoujo fic, Lilly's father makes fun of Hanako's scars. This is even worse than it sounds; in the game, it is revealed that Hanako's parents died in the fire that gave her the scars, and her mother sacrificed herself protecting her, and she was bullied for her appearances. His doing so in spite of being forewarned by Akira causes Hanako to have a breakdown.
In the Ah! My Goddess story, "Ah! Archfall!", a good example of this is shown in an exchange between Belldandy and the main character, Jago:
“Well we could try… singing?” Belldandy asked hopefully. At this, Jago did raise his hat, peering out from under the brim.
“Well that depends; would you rather be cremated or buried at sea?”
In the Girls und Panzer fanfic, Boys Und Sensha-do, during Chapter 7, Shiho not only goes through with her plan of disowning Miho, but she does so in what might be the worst possible way; she visits Miho in the hospital for the sole purpose of telling her that.
Hideyoshi Katsuko, one of Shiho's students, chidingly tells Miho that six bruised ribs shouldn't be enough to stop one of Shiho's children from commanding a tanknote This comes off as even worse if you assume that Hideyoshi knows that Miho not only doesn't like her family's style, but has been disowned, and that as Miho and her team turned sensha-do into a mockery of what it was, she enjoys coaching one of their opponents.
In the episode 9 epilogue, he demoted ProtoMan in front of all the other robots when it was Wily's fault the plan failed, and made it so he can never leave the fortress without permission again.
Metal Man decapitates a Sniper Joe in Episode 9, though it isn't killed.
Centaur Man gets one in episode 11 when he imitates a heartbroken Mega Man while he's relaying information to Wily.
In Episode 11 Wily demotes ProtoMan to the lowest rung yet, prevents him from going on missions, and weaponizes a Pet the Dog moment with Bass to further hurt him. Then, in a later chapter, he burns ProtoMan's photograph of himself and Mega Man together.
Episode 12 has Miss T ripping apart Tonya's wedding dress.
Wisdom and Courage: Every time Veran appears in person, it's guaranteed she'll pull as much puppy-punting as she possibly can simply because she thinks it's fun. Examples include, but are not limited to, setting fire to the Great Deku Tree to speed up Link's progress and nearly killing Saria in doing so, planting a Forceful Kiss on Link in front of Zelda purely to hurt the latter, and finally giving Zelda a Traumatic Haircut and leaving her near-death while making Link watch her do so in order to push him over the Despair Event Horizon. She even outright states that she could easily swoop in and kill Link and Zelda at any time, but wants to completely and utterly Mind Rape them first.
In Act I, when Ghaldin returns and takes back control of Apoch and Astreal, the first thing he decides to do with Dark and Rason, whom Apoch and Astreal had brainwashed into serving them in order to kill Ghaldin only for it to backfire, is make them fight their respective Love Interests, Mizore and Kurumu.
In Act II, Miyabi extorts Mizore for sex in exchange for sparing Tsurara's life, and the minute he's finished, orders Tsurara's execution regardless while mocking Mizore's gullibility.
In Act III, Hokuto steals Felucia's Soul Jar and uses it to force Felucia to aid him in his plans while letting Jovian and Jacqueline use her as their sexual plaything.
Also in Act III, the very first thing Kuyou does upon his arrival at Yokai is burn Astreal to death. During his fight with the gang, he even takes the time out to incinerate several non-combatants.
In Act IV chapter 23, Jovian taunts Tsukune over the phone about her sexual abuse of Kyouko.
During their face-off in Act IV, Jacqueline blows up Tsukune's house just to hurt him; fortunately, Gin gets Tsukune's mom out in time.
Superwomen of Eva: Lilith's Herald gives us an especially brutal example. Gendo's thug Chiron gives this treatment to Shinji by literally kicking him in the side. Making this even worse is that Chiron had already spent a considerable amount of time brutalizing and torturing Shinji under Gendo's orders, and he's already severely injured to the point where he can't even move.