It is a very good thing to have a built-in bullshit detector, but a bad thing when the bullshit detector crowds out the rest of your brain; that's why they call it being narrow-minded. You quickly reach the stage where anything ambitious, complicated, or merely foreign gets spat on along with the things that are genuinely phoney.I'd add to this that those with HABS (hyperactive BS) syndrome, including cynics who proudly belong to "skeptics" societies, -- which revel in the presumed stupidity of others who don't belong to the club -- tend to reflexively spit on anything they regard as unorthodox or anomalous, including claims of psi experiences and experiments supporting those claims.
This is not to say that a refined BS detector is a bad thing. On the contrary, it is a necessity, especially when it comes to evaluating all those exciting new opportunities arriving in our email every day from Nigeria.
A truly refined BS detector, somewhat rare to find these days, is also recursive -- it applies its discernment not only to unexpected claims, but also to itself. It does this both to avoid the mindless spit reflex and to discriminate between the genuinely interesting and the genuinely phoney. Some day I should write a book on the tension between critical thinking and creativity, and how to apply these two skills to each other.