He received a flattering compliment from Sunita immediately after the speech.

Compliment : a polite expression of praise or admiration.
Disparagement : the act of speaking about someone in a negative or belittling way.
Eulogy : a speech or piece of writing that praises someone or something highly, especially a tribute to someone who has just died.
Contempt : the feeling that a person or a thing is worthless or beneath consideration.
Notoriety : the state of being famous or well known for some bad quality or deed.

Antonym of Compliment is Disparagement