What annoys me are people who misuse the word sarcasm. Sometimes I find that they describe themselves as sarcastic and use the word as though it has positive connotations. It does not.
1: a sharp and often satirical or ironic utterance designed to cut or give pain; 2 a: a mode of satirical wit depending for its effect on bitter, caustic, and often ironic language that is usually directed against an individual
I believe that the description most people are actually looking for when they use the word sarcastic is "smart ass."
Facetious would be a better word but few people actually use it in daily conversation.
1: joking or jesting often inappropriately; 2: meant to be humorous or funny : not serious