To me, political stances, or groups are shades of gray.
There is a lot of libertarians who call themselves conservatives, until you start questioning them and it becomes evident that they believe in the libertarian POV. I find it hard to believe that any person is 100% anything; democrat, republican, libertarian, socialist, fascist ... whatever. There is no purity in politics.
Most people have beliefs that may agree with socialists on one subject, and agree with republicans on another. Nobody toes the party line like a modern American socialist.
It has become popular among modern progressives (socialists) to confuse this scale or range of beliefs that real people live with and loudly proclaim LIAR. (Usually right after the number one go-to RACIST). Especially since, it is in the DNA of a so-called progressive to yell at anyone who does not agree with them 100%.
Progressive: The sky is blue.
Normal person: Well, there is a white cloud ....
Progressive; LIAR! RACIST!