The antonyms for the phrase "are gracious to" would be those that convey the opposite sentiment. These could include terms such as ungrateful, unsympathetic, unkind, inconsiderate, uncaring, and indifferent. When people are not gracious, they do not show appreciation, empathy, or kindness towards others. This can cause hurt feelings and negative reactions from those who are on the receiving end of such behavior. Being gracious is an important trait to develop as it promotes positivity, understanding, and goodwill in relationships. Conversely, being ungracious can lead to strained relationships, misunderstandings, and conflicts.