Anti-intellectualism, though that’s probably not quite the right term. We’re very good at giving our own opinion, to the point where just about anyone feels justified in telling you about your own area, regardless of how much they actually know about it.
This comes up a huge amount with all that fluoridation, chemtrails, vaccination, etc. nonsense where cobbled together hearsay, conjecture, and shit research is passed off as legitimate, informed opinion which deserves proper recognition.
Same can sort of be said for STEM graduates who deem it fit to look down on anyone who’s done the humanities or social sciences and demand their opinion is just as valid (or that anything outside of STEM, IT, commerce etc. is pointless), though that’s hardly likely to cause the same sort of public policy nightmare as the bad science crowd.
I might push this to people who rage about the Irish language, passing off their opinion of Irish speakers and the status of the language as proof-positive that Irish speakers are enjoying all sorts of extravagant benefits at the expense of healthcare and education, when native Irish speakers are really being failed disproportionately to the whingers in both areas.
Also, not related, but we need a surface-to-Harbo missile.