Some woman just said she wishes she could kiss the guy that killed Hitler and I don't know if I should ruin that for her.

The line hinges on dark irony: the speaker overhears a celebratory wish to “kiss the guy that killed Hitler,” then recognizes the historical complication that Hitler died by suicide. The humor comes from the social dilemma—whether to correct someone and puncture their righteous satisfaction, or to let the sentiment stand as a shorthand for anti-fascist feeling. Beneath the joke is a comment on how moral certainty can ride on simplified history, and how correcting the record can feel pedantic or cruel even when it’s true. The quote also gestures at the way collective hatred of Hitler becomes a cultural reflex that can override factual nuance.