Its called Sarcasm, its the British way of wit.
The use of irony to mock or convey contempt.
Mental sharpness and inventiveness; keen intelligence.
Have knowledge: "I wot that but too well".
And I believe the saying is 'Sarcasm is the lowest form of wit'.
Just because you seem to be failing with word definitions. Here's another word for 'Lowest' for you: Worst