I view it as facile to point to some purported expert who claims, usually on TV, some position related to anything that seems clearly and obviously contrary to "common sense", whatever the topic. In general, I'd opine anyone claiming to be a scientific expert who is often on "the news" likely isn't. And when their claimed "expertise" is in some field which is not really scientific, well, have at it.
The fact that some folks are perhaps presented as experts on a topic like say "transition between sexes" doesn't mean there aren't real experts in the world with a useful perspective. I noted previously the car mechanic, who if he's decent is an expert, on which many of us will rely.
Don't over generalize about experts. Some do exist, and "we" have to rely on their collective expertise, unless we're willing to spend the time and effort to truly develop our own. Usually, folks just find some quack expert that provides the opinion they want about some topic.