For those who avoid reading YouTube comments, the basic story is that Michelle Kwan videos have been attacked for years by the same person using multiple accounts. This person has literally posted hundreds, if not thousands, of negative comments over a span of quite a few years. Its accounts will even talk to each other in an attempt to make its numbers appear larger, but it is obvious that it is the same person.
I once tried to figure out who this person's real identity actually was, but I was never able to come up with anything definitive. I would love to know if it is someone with a personal grudge against her or just a typical loon.
Now, more recently, there have been tons of racist comments left on videos of her performances. These are very different from the way the crazy, obsessed hater typically operates, so they're probably not related.