irony
incongruity between what might be expected and what actually occurs
the irony of Ireland's copying the nation she most hated
sarcasm
satire
caustic remark
witty language used to convey insults or scorn
he used sarcasm to upset his opponent
irony is wasted on the stupid
Satire is a sort of glass, wherein beholders do generally discover everybody's face but their own
Jonathan Swift
a trope that involves incongruity between what is expected and what occurs