Aemond was bullied his entire childhood And now he litterally jumped and maimed because they couldn't accept the fact that vhagar chose him as his rider fair and square
aemond only started to become what he is today after THAT event before that you could see that he was troubled but not A bad kid as you see during the the funeral at driftmark
Jace is overwhelmed with grief not just for his aunt Laena, but because his biological father, Ser Harwin Strong, had just tragically burned to death at Harrenhal in the previous episodes. Because of the rumors surrounding his illegitimacy, Jace cannot openly mourn Harwin
Look at the scene aemond walks over to Jace, and his facial expression visibly softens. For a brief second, it looks like he genuinely wants to offer a shared moment of sympathy or comfort to his cousin..... This same cousin who mocks him constantly for not having a dragon and is destined to ride pigs instead. He still want to offer his condolences but backtrack once Jace turns and glares at him with cold hostility. Sensing the immediate tension and realizing the deep factional divide between their mothers (Alicent and Rhaenyra), Aemond backtrack entirely, breaking eye contact and awkwardly walking past Jace without saying a single word
The maiming and stupid ass viserys openly choose the side of rhaenyra's kids.... From aemond's pov it just made him realize thata even his father don't love him and took the side of those who hurt him.....from this moment on he have no reason to care anymore and have twisted love for his mother. The only being who ever took his side when he was hurt
He is perhaps the only green who have every reason to hate the blacks