[ksenzee]

No need to rely on a gut feeling: it's in the dictionary. Merriam-Webster defines bullshit as "to talk nonsense to, especially with the intention of deceiving or misleading." So it's not being objectively wrong, it's peddling nonsense. The term has come into popular use even among people who don't swear much, because it's precise and evocative.

[c7b]

Ok, I'll take that. Still not sure about the argument under that definition, though. There are disciplines where 'talking nonsense with the intention to deceive' would objectively be a smart strategy, eg Poker. However, Poker should fall under the 'no-BS' fields according to OP (he lists sports, and expressly mentions chess there; any sort of trash-talking in any sport would also fall under that definition, and trash-talking athletes can still be successful - it's quite common in martial arts eg). My guess is that the OP would argue that Poker or martial arts still are 'no-BS' fields, we just need a better definition of BS.

But that just shows that the argument doesn't work with this definition, and the onus is still on the OP of providing a definition that works for his argument (or we have to conclude that his argument doesn't work).