If you've never experienced it before, the first time you work with someone who is a pathological liar and bullshitter is a completely disorienting experience. Normal people just don't lie that brazenly and with so little remorse - so you walk out of meetings wondering if perhaps you just misunderstood because there's no way someone would straight up lie that way.
Interestingly, both of the worst bullshitters I've ever met were in academia - and the business world has been a breath of fresh air in comparison. When I used to work in computational biology, I met several senior professors who lead big labs who had absolutely no understanding of any of the methods used by the grad students in their group.