I'm imagining the most wealthy (who think they know what's best for the world, like P.T.) would say something eerily similar to what you are saying.

The very rich have access to all of the information. One can't expect people who face significant barriers to higher education (and other means of informing themselves) to be on the level of experts, the educated and informed, or the very rich.

Why are people against experts, the educated, and the informed?

Partisan news media seems like the likely culprit. A broken political system posing as democracy could be another factor to consider. Opaque algorithms that put people into information bubbles (with the intention to make them addicted and as uninformed/reactionary as possible) are definitely a major factor.