All I can say as a Michigander is I've BARELY ever heard anyone say they dislike living in the state, Michiganders are proud of where they live, for the most part. I'm not sure of the validity of the findings, but all I can say about the ONE state that hates us, it's because they AIN'T us.
If you're thinking about where you're going to spend your retirement, keep in mind that some places are better than others. Find out how Michigan ranks among the best and worst states to retire.