The notion of domain-independent rationality is the favourite way for some nerds (so called "sceptics") to pump up their egos and then throw around nonsensical

The notion of domain-independent rationality is the favourite way for some nerds (so called "sceptics") to pump up their egos and then throw around nonsensical judgements in domains they don't know the first thing about. But hey, they know the Bayes theorem! So they will out-smart everyone on every topic! In some sense this is an intellectual philosophers stone, the notion (it is never said out loud but that is what seems to happen subconsciously) that once you are "rational" enough you can judge things more effectively without having expertise in a given field, medicine for example. A good example is Nassim Taleb's last book, a collection of completely ridiculous opinions on biology, medicine, computing and fitness...