There are so many...
The obvious ones:
Any sort of pseudoscience (homeopathy, astrology)
Conspiracy theories (9/11, moon landing)
Expensive magic pills that make you slim
Racism, fascism
Less obvious, subtle:
“You can’t judge other people’s opinions”
Any inadequate or naive view on free will (as far as I can see, the amount of naive free willers is far bigger than that of theists)
Copenhagen interpretation of quantum mechanics (maybe not anymore?)
Probably still controversial or hard to avoid even with good epistemic hygiene:
Rejection of cryonics
Tabooing human sexuality
There are so many...
The obvious ones:
Any sort of pseudoscience (homeopathy, astrology)
Conspiracy theories (9/11, moon landing)
Expensive magic pills that make you slim
Racism, fascism
Less obvious, subtle:
“You can’t judge other people’s opinions”
Any inadequate or naive view on free will (as far as I can see, the amount of naive free willers is far bigger than that of theists)
Copenhagen interpretation of quantum mechanics (maybe not anymore?)
Probably still controversial or hard to avoid even with good epistemic hygiene:
Rejection of cryonics
Tabooing human sexuality