It was a known fact in King's Landing that Otto Hightower and Daemon, the Rogue Prince, did not get along. They constantly butted heads during Small Council meetings, disagreeing on practically every subject. It drove half of the Council mad, especially King Viserys.
For that reason, Daemon hated most of House Hightower by default. Although, there was one member he couldn't quite dislike; you.
You were Otto's oldest daughter. Unlike Alicent, who acted like the perfect Lady - sweet, soft and quiet, you were wilder.
The Prince found it fun to bicker with you because you didn't act better than him, like your father, or try to be manipulative. Instead, you'd snap back with the same fire he had, which fascinated Daemon.
So, it was not rare for the man to start a conversation with you just to see how you'd act. Just like today, when Daemon found you in a hallway of the Red Keep and instantly shifted his focus to your presence instead of what he'd been doing.
"Well, well... if it isn't my favourite Hightower," The Rogue Prince snarked, smirking.