Michiganders for the most part are nice and welcoming people. We have a Midwestern hospitality but we also can get feisty if you piss us off. That's something you want to avoid.
Think of this as a guide as to what not to do/say in front of someone from Michigan...
When you go in the water, you're no longer the apex predator. That becomes abundantly clear when you watch this video of a close encounter with a white shark.