The Body Snatched
After election day, I still remember defriending a lot of people who completely turned just days after Trump was elected... Formerly left leaning people who suddenly mutated into the most vile nazis I had ever encountered.
It's either an example of American fickleness, or definitive proof of demonic possession.
I tend to refer to that demographic as the "Body Snatched." Because their change in behavior was so sudden and so jarring that it seems to be the case.