I am not because I live in a pretty conservative area. So I try to get some leftist points through to coworkers without opening myself up to the ridicule of just being a “commy degenerate” in their eyes. So I think I can get through to them better without outting myself as a Marxist.
I only go openly socialist with people I know are also socialist. So, one coworker.
But I am willing to challenge bosses openly. I try to be a good example.