I could also say inside an elevator: "Anarchism is not chaos. This is capitalist and socialist propaganda. It comes down to mutual aid. People are capable of self-organizing themselves without a boss or any authority."

David Graeber wrote one of the best summaries: https://theanarchistlibrary.org/library/david-graeber-are-you-an-anarchist-the-answer-may-surprise-you Each point is easy to communicate, and each one might be enough for an elevator pitch.