Michael fans have been called Michaelers since the early 90s. It was sometimes thought to reference collecting memorabilia, but fans would call themselves Michaelers and say "keep Michaeling" . I'm not sure when they started calling themselves moonwalkers, probably after a website called them that, which was later shut down for impersonating Michael. sadly, some of the quotes from that site are still attributed to MJ. But he never called fans "moonwalkers," it was more personal to him and he called them "My fans" or "the fans".