Yes.
Sarcasm is expressing comments in an ironic way, such as saying "don't work too hard" to a lazy worker.
Therefore sarcasm may be interpreted as not telling the truth about something.
Not telling the truth can be lying, flattery etc.
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Telling the truth can be honesty, insult etc.
So, as result: being sarcastic = not telling the truth
=> not being sarcastic = {lying, insult etc..}
Therefore not being sarcastic =/= being real.
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