1 Making jokes about Polygamy. Mormons no longer practice polygamy.
2 Buying a Mormon a coffee or beer. Mormons don’t drink caffeine or alcohol. Some drink caffeinated sodas.
3 Complaining about the last time Mormon missionaries were at your door. All Mormons know missionaries, are related to missionaries or were a missionary themselves. You might be complaining about something they have experienced in the past–but from the other end.
4 Assuming all Mormons are from Utah. Currently more Mormons live outside than inside the United States.