This is where someone looks around at everyone behaving a certain way or doing certain things and decides that they’re two of lazy, stupid or evil.
Common examples are the way liberals tend to assume this of any conservative policy or the way that conservatives tend to assume this of SAHMs with dirty houses and/or kids.
There’s not really a political divide here, it’s common across the political spectrum. It’s just a recurring tendency that people slip into.
I guess you could also call it Chesterton’s busted fence.