Final answer:
The tiny old man in the violet cloak called Mr. Dursley a "Muggle" which made him rethink the awkward situation.
Step-by-step explanation:
The diminutive elderly man in the violet cloak caught Mr. Dursley off guard by labeling him a "Muggle," a term denoting non-magical individuals in the Harry Potter series. This simple utterance sparked a cascade of thoughts in Mr. Dursley's mind, prompting him to reconsider the peculiar situation.
It dawned on him that the tiny old man must be connected to the mysterious and unfamiliar realm of magic, creating a sense of unease within Mr. Dursley. The encounter became a pivotal moment, unraveling the ordinary and thrusting Mr. Dursley into a reality he had never fathomed.
The term "Muggle" served as a key to unlock a realm of enchantment and bewilderment, setting the stage for the magical journey that awaited both Mr. Dursley and readers alike in the unfolding narrative.