The point, I think, is that laypeople and scientists alike fall further and further into the fallacy of appeal to authority: 'a scientist said it's true, therefore it is true!' (for simplicity, true == a fact correctly expressed).

That thing may be true, but the rising disdain for not accepting a conclusion when the evidence isn't presented alongside is worrisome. The difference between science and religion is that science draws conclusions from reproducible research. Yet - especially now - many people take the naked word of 'a scientist' the same way a religious fanatic takes the word of their spiritual leader.

This definition gave me a lot of clarity: an expert is someone who has, can get, can make, or can cause to be made - and presents - evidence that supports their conclusions.