That number feels off by a lot to me. I think i can say i'm quite good at socializing, quite above average when comparing to people I meet and work with. I'd rate my engineering skills about average level and i have a firm dislike of fraud and of people acting to be better/smarter/faster than they really are. In my career I've come across managers of the julius type, as well of the narcissistic type, even a sociopath. I would estimate 10 to 20 percent of people are of the Julius type.
It was a subtle ref to the 80/20 rule in that most people likely oscillate between the julius and the useful. Some of that 80% are full time julius for sure.