I'm exaggerating somewhat...only 75% of my career.
I work in the DoD (mostly U.S. Army), and many senior service members, commanders, even some DoD civilians do not like to have their authority challenged, and view opinions that differ from theirs as dissent. Many people simply go with the flow, don't rock the boat, etc., but that was never me. If someone said something that I thought was factually or likely wrong, in most cases I would speak up; sometimes I got yelled at.
Not all senior leaders are that way. I worked with and for Mike Flynn (yeah, that Mike Flynn) on several occasions. Although I didn't always agree with him, I always felt I could tell him whatever was on my mind. He might get fired up, but certainly wouldn't hold it against you. Overall a great officer and leader.
In many academic institutions, it's much worse. Merely the hint of opposition to liberal orthodoxy is grounds for dismissal. There is an interesting podcast called
The Heretic that is about an Australian marine geophysicist, Peter Ridd, whose area of expertise is the Great Barrier Reef. His conclusion is that coral bleaching is a natural occurrence and nothing to be alarmed about. The University where he worked terminated him for damaging the school's reputation. Even if Ridd is wrong, any academic institution dedicated to advancing scientific discovery should encourage dissenting opinions because it pushes everyone to look deeper to validate their hypothesis.