To those declaring themselves extraordinary, or flawless, or super great at detecting bullshit, without anything to back it up...examples?
For one, if someone was a good bullshitter, you wouldn't be any wiser to the situation anyway, so it's unverifiable. But, putting that aside, you probably have some examples to back up your skills. Like, the time you when X did Y and you saw that X was trying to BS you. And you saw this was the case because of ______.
Otherwise, I'm calling bullshit on you.
Also, I'd guess that BS detection is more experience related than anything else. I probably couldn't tell if someone who has never crocheted tried to con me into thinking that they were master crochet-ers. I don't know anything about it.