Answered a question on Quora
https://www.quora.com/You-are-at-your-work-place-and-a-customer-is-teaching-you-how-to-do-your-job-At-the-end-he-was-wrong-all-along-and-then-he-starts-blaming-you-If-you-hit-him-her-are-you-wrong/answer/Abby-Octavio