Like "you don't know as much as I do, I Googled a page and it says..." type. No they definitely know very little about the stuffs. And I personally heard and saw they tried to persuade OTHER patients, of different symptoms to listen to their "theories".
For every 5 “type” People you mention there’s 1 common person who really does spend the time doing their research and likely knows more about the drug than the doctor in some ways (typically they just lack the context of interactions and side effects). A good doctor will listen to what the patient says and then discuss with them what they think with an open mind. Good doctors are rare. Especially nowadays with all this arrogance that they know everything as you say.