He is too thick-skinned.

He wrote another letter, and thanked me for correcting his mistakes, and said it made him feel glad because it showed I was beginning to take an interest in him when I wanted him to spell better.
Did you ever?
Miss Marwood says it is wrong to hate anyone, but I don't care, I hate Cyrus Brisk." "Mrs.Cyrus Brisk WOULD be an awful name," giggled Felicity.
"Flossie Brisk says Cyrus is ruining all the trees on his father's place cutting your name on them," said Sara Ray.

"His father told him he would whip him if he didn't stop, but Cyrus keeps right on.

He told Flossie it relieved his feelings.

Flossie says he cut yours and his together on the birch tree in front of the parlour window, and a row of hearts around them." "Just where every visitor can see them, I suppose," lamented Cecily.