In the same way a gay person can be outed without ever explicitly coming out to their peers. There are social queues that people can pick up on.
To enumerate a few:
1. Lack of participation in political events. "Silence is violence". Having a private opinion is suspicious.
2. Participating in activities which are a-political but have political consequences. For example, going to a church or a gun range isn't a political statement but it can be interpreted as one (with all the baggage that comes with it).
3. A lack of "tribal knowledge". Political tribes have their own set of facts and theories which influences their view of the world. Acknowledging facts from other tribes (political or not) can out you (either as an outsider or as non-committal).
4. And, of course, racial, social, or sexual characteristics can be used to make inferences about your beliefs. My sister, for example, was spit on at a protest at her university. Partially, because she didn't participate but also because she was a "white bitch". This was said by a (presumably) white woman. This happened three years ago.
To enumerate a few:
1. Lack of participation in political events. "Silence is violence". Having a private opinion is suspicious.
2. Participating in activities which are a-political but have political consequences. For example, going to a church or a gun range isn't a political statement but it can be interpreted as one (with all the baggage that comes with it).
3. A lack of "tribal knowledge". Political tribes have their own set of facts and theories which influences their view of the world. Acknowledging facts from other tribes (political or not) can out you (either as an outsider or as non-committal).
4. And, of course, racial, social, or sexual characteristics can be used to make inferences about your beliefs. My sister, for example, was spit on at a protest at her university. Partially, because she didn't participate but also because she was a "white bitch". This was said by a (presumably) white woman. This happened three years ago.