I do think it would be a social/linguistic error to respond to weirdness, joking hyperbole, or sarcasm with with “Liar!” or similar variant in a sincere tone.
Generally I prefer “Get thee behind me, Prince of Lies!” or possibly “You should be a statistician!” if I’m feeling particularly vindictive.
Generally I prefer “Get thee behind me, Prince of Lies!” or possibly “You should be a statistician!” if I’m feeling particularly vindictive.
But I get your point.