General Antonyms:
* Pleased
* Delighted
* Happy
* Satisfied
* Content
* Unbothered
* Indifferent (meaning not caring about the offense)
Specific Antonyms:
* Complimented (if the offense was an insult)
* Appreciated (if the offense was a slight)
* Honored (if the offense was a disrespect)
The best antonym will depend on the specific situation and the intended meaning.