I think numerous examples of this are hiding in plain sight. Among highly educated people of this era (supposedly intellectual), (probably) most of them have been through the indoctrination mill and have arrived at a point where irrationality looks rational.
Evolutionism (essentially, “rocks can turn into people if left alone long enough”)
Multiverse (it’s been “proven” mathematically possible)
Utopianism (if people only weren’t corrupted by oppression, they’d become perfect and happy ever after, whistling while they work)
Freudianism (oppression, repression and suppression are at fault; the individual miscreant is never at fault; original sin doesn’t exist)
Scientism (there’s a perfectly good scientific explanation
for everything; hence, there is no God)
Anthropogenic climate change (and the projections of near-term global catastrophe unless we spend trillion$ to fight it; it’s settled science)
Trump is evil (despite a panoply of futile effort to pin anything on him)
Trump’s supporters are cult followers and worse than Trump himself (since they oppose efforts to radically transform America)
Trump and his supporters are fascists (despite the fact they cannot even properly define the word or the concept — truth told, they need only look in a mirror to see one)
Etc.