In On Being Good at Seeming Smart, Eric Schwitzgebel writes (bold emphasis mine):
[A]fter a colloquium at which the student had asked a question, one faculty member expressed to me how impressive the student was. I was struck by that remark because I had thought the student’s question had actually been pretty poor. But it occurred to me that the question had seemed, superficially, to be smart. That is, if you didn’t think too much about the content but rather just about the tone and delivery, you probably would get a strong impression of smartness. In fact, my overall view of this student was that he was about average — neither particularly good nor particularly bad — but that he was a master of seeming smart: He had the confidence, the delivery, the style, all the paraphernalia of smartness, without an especially large dose of the actual thing.
Since then, I have been collecting anecdotal data on seeming smart. One thing I’ve noticed is what sort of person tends spontaneously to be described, in my presence, as “seeming smart”. A very striking pattern emerges: In every case I have noted the smart-seeming person has been a young white male. Now my sample size is small and philosophy is about 75% white male anyway, so I want to be cautious in this inference. [...]