Who in that school would have Imagined that KD would have such an equation with his father? Others were surprised to see him getting slapped but Kiya felt the pain because she has the same issue of her mother not understanding her. Similarly, KD's dad fails to underdstand KD.
Kiya is a girl who is disconnected from freedom, freedom of her actions, her thoughts and her desires. She had never expected (may be) that KD would have the same side in him, that he also will have family issues and so on.
Shock, Surprise, Hurt, Pain, ...it all came together
