[SoftTalker]

I think it's more likely a nervous candidate who may not be comfortable or experienced in conversation, as many introverted tech type people seem to be. I don't think it's being taught; it's more likely the result of the candidate not having had interview coaching at all.

[yamtaddle]

Yeah, nerves plus the big question-mark of not knowing what the interviewer's actually looking for. One interviewer's perfect answer will be another's "red flag" (see this very thread, where directly and correctly answering the asked question apparently got you put in the "meh" bucket).