Your stupid.
It's not hard to tell.
sar·casm noun \ˈsär-ˌka-zəm\
Definition of SARCASM
1: a sharp and often satirical or ironic utterance designed to cut or give pain
2a : a mode of satirical wit depending for its effect on bitter, caustic, and often ironic language that is usually directed against an individual
b : the use or language of sarcasm