Calling someone a liar is a strong claim. Memes get away with it because they’re framed as humor, not formal accusation. The audience can laugh while still expressing judgment.
Psychologically, “why is he lying?” behaves like a pattern-matching tool. Viewers look for reasons a person would say something that contradicts reality. That search for motives is a human habit—people ask “what’s the incentive?” It’s just that the meme squeezes that process into a punchy caption.
There’s also a social feedback loop. If a few top comments suggest the person is lying, more users follow that lead. Even if nobody has complete evidence, the crowd’s tone can make skepticism feel like certainty.
None of this means the meme is “always wrong.” It means the meme usually reflects interpretation, not verification. That distinction matters, especially when the clip is edited, incomplete, or taken out of context.