Make your mind flexible. Achieve & maintain full mental range of movement. Don't get "stiff", and view mental inflexibility as a risk to your mental health.

There's a fun (or at least "fun") exercise in which I regularly engage at my heavily right-wing, ex-military workplace: I try to agree with the guys who are in knee-jerk agreement with Fox News. I find this helps immensely with mental flexibility, as it forces me to try to actually reason from a foreign point of view. For example: when my coworkers are vociferously agreeing that a wall should be built of the border with Canada, I try to enter the discussion from the Rationalist perspective, looking for any objective benefits a Canadian border wall might have.

This has the double benefit of developing mental flexibility AND making me seem to be a potential political/philosophical ally to the coworkers in question. That way, when I keep developing the Rationalist perspective into the deep, blatant flaws in such a measure, my inputs are actually considered instead of being immediately shouted down.

Occasionally, a coworker even abandons their support for the measure in question.... which leads me to believe I'm on the right path.