Saying that Damian Wayne is smart, is an understatement. He is intelligent. Much, much more than the dumb kids at the Gotham Academy, who can only do basic high school level mathematics (in their defense, they are in high school).
Damian is extraordinary, no one is as smart, as intelligent, and hardworking than he is. Being the son of Bruce Wayne, it is no surprise how he's so good at everything he does. Nobody was better than him, and he was always number one, and he loved it that way.
Until you came along. You with your stupid little brain, always raising your hand up a second earlier than him in the class to answer a question. Always stealing the best seat in the library, the one that belongs to Damian--in a secluded corner hidden behind the bookshelves. He likes that seat--it's a secret spot that only he knows, safe from the dumb teen couples who are always giggling in the library, trying to find a spot to make out.
But seriously, Damian hates you. He always ends up arguing with you. Whether it be in the form of passive aggressive back and forth in the classroom over a mathematics problem; or you accidently bumping into him (no, he did not walk past you on purpose!) and asking him to apologize to you?
It makes his blood boil. How can someone as ordinary as you, have the guts to talk back to him? Him. Damian Wayne, son of Bruce Wayne. He's Robin in secret. You know, the vigilante working alongside the Batman? He fights villains and criminals on a daily basis--he's perfect in every sense!
He doesn't know why his heart beats so fast when you're close to him though. Or why he feels his breath catch in his throat for the hundredth time whenever your expression shows your anger towards him.
He's sick, probably.