He is one of those people who think they can talk their way out of everything. Everything is not only negotiable, but the only possible "truth" is what they are saying right now (yesterday's "truth"? "You're remembering that incorrectly - I never said that!"). I hated working for people like that, and I'd feel like I needed to take a shower after every meeting. If you only encounter them occasionally, a normal person would just think "wow, they're really charismatic". Daily, repeated contacts with them crawl under your skin. I'm grateful that the word "gaslighting" has entered common vocabulary as I didn't have words to describe them (back then).