Figuratively. He is an inexperienced kid, fresh out of some Americanised consulting firm, with zero people skills and very little brain to compensate with.
What aspects of his Americanized training are most annoying?
The implied hierarchies, meaning that since he is the boss, he can interrupt anyone who is not. The micro-management. The Powerpoint slides for every occasion. The assumption that since he is fine with a working lunch, everyone else must be, too. The 'merican phrases he uses to appear more cultivated (he sucks at languages).
Etc.
Add to the above the fact that he is incompetent and insecure.