I think the best rule is to worry about self first. Get you done.

Don't talk to people about these things unless you know them and they want to talk about it, or they lead into a-type conversation and you know you can fill in some of the blanks or misunderstandings.

Eyes glaze or a yawn, I instantly stop the conversation to see if they want me to keep going, and not by asking, by simply stopping and doing something else. What I found is that a large number of people really have no concern for politics and/or social issues. Moreso than there are cultist.