There are at least four issues here, and probably more I am not thinking about. First, modern political culture seems to often consider experts as unreliable, they pick and choose who they listen to. Those who listen without preselecting favourites, learn.
Second, people have been told that experts are wrong so often that there is a subculture around it. Sometimes doubt in experts is justified, sometimes its just foolish.
Third, modern Western society, with the exception of a few European countries, has the citizens distrusting government. Generations of poor government, which is common, has led to disbelief when something contradicts a person's lived experience.
Fourth, distrust in media is at an all time high. Drastic reductions in investigative journalism, increased biases in reporting, and cost saving measures like churnalism, have led to increased distrust of reporting. Right now that is having a cost other than just a financial one.
ETA had to fix a bunch of typos.