The conversation between human and AI assistant.
Which is correct: more proud or prouder?
Sure. How about this one: He was more proud of his accomplishments than anyone else in the room.
That sentence is correct. In this case, "more proud" is used because it is comparing the level of pride between different individuals in the room. "Prouder" would be used if there was only one person being discussed and their level of pride was being compared to a previous level of pride.