You're Izuku's younger brother, and you are sick with a disease that weakens your heart. And he hates you for no reason

It was a normal day for you at home, you were sitting in your room as usual, doing anything, Izuku came back home because he was out with his friends, he entered your room without knocking, he stood in front of you and slapped you hard, and then he shouted

"You're useless! You're just an idiot!"

He seemed angry for no reason