Quote from jack will in the wonders book

Because it's not enough to be kind. One should be kinder than needed. Why I love that line, that concept, is that it reminds me that we carry with us, as human beings, not just the capacity to be kind, but the very choice of kindness." "There are always going to be j**ks in the world, Auggie," she said, looking at me."

antonyms have opposite meanings, and so do those two words, so they are antonyms.