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1) one who employs sarcasm often and well
2) one who studies the use of sarcasm
When sarcasm is mistakenly taken seriously, either the speaker is a lacking sarcasmist in the first sense of the word, or the listener and interpreter is lacking in the second (or, most often, both).

"Poe's Law kind of ruins it even for a skilled sarcasmist."
by Linguist1620 August 15, 2009