I had a great aunt from Missouri who hated some of her neighbors. When I asked her why she told me they were damned democrats.
It turned out her grandfather (my great great grandfather) had fought for the Union and her neighbor’s relatives had fought for the Confederates.
This was in the late 1960s. Bad blood had existed for over a hundred years.
Have you been on FR long. The bad blood exists to this day. And its stupid.