I'm not sure we should mark this down as a political and cultural climate thing. I'm more convinced the guy was simply an asshole and it so happens that he felt strongly about politics.
Hence, many people are very secretive of their beliefs if they don't conform, and they may even "play along" like Winston does during the "Two Minutes Hate" (1984). Unlike 1984, we don't have a state or federal "thought police" but we kind of have something similar - a "thought mob" that patrols coworkers for evidence of thought crime.