General synonyms:
* Irony (especially when it's used to mock or criticize)
* Satire (often used in writing or performance)
* Mockery (emphasizes the intention to ridicule)
* Derision (stronger than mockery, implies contempt)
* Cynicism (a more general attitude of skepticism and disbelief)
More specific synonyms:
* Wry humor (dry and understated)
* Deadpan (delivered with a flat, emotionless tone)
* Cutting remark (sharp and hurtful)
* Snide comment (condescending and insulting)
* Bitter jest (implies anger or resentment)
The best synonym to use will depend on the specific context and the intended meaning.