Of course people know how to hide things that aren't safe to tell everyone. I do, however, genuinely mean what I'm saying. I worked somewhere once where the nature of the work meant almost everyone was of a particular political persuasion. I was of the opposite political persuasion. I was also one of the most junior employees there. It was a good enough bunch of people that I felt safe mentioning it in passing one day, and it led to a really great conversation. I was not afraid of being fired for it, but more importantly, I was not afraid of being ostracized for it.