One of the reasons for that assumption (and this addresses a different post in this thread) is that when I worked at WDW, having DL cast visit was one of the most MAGICAL things that could happen. We wouldn't simply be kind to them. We would take them on tours and/or offer them various perks not available to guests. I, myself, took several groups of DLanders around the parks and everyone had an amazing time. One was a group of very tall girls from the DL entertainment department who called themselves "The Glamazons." They enjoyed the parks but they had an entertaining fixation on sampling as many desserts they could find. Another was a group of DL CMs with a gothic bent. Their request was for several hours of uninterrupted rides on the HM. They were happily accommodated.
So whether you're east coast or west coast oriented, if you come across someone who insults your home park or you as its fan, you're merely dealing with a ... well, loosely translated from an adult expression inappropriate to this forum: a very unkind person who is more concerned with regional superiority than Disney magic.