There's a certain amount of speculation as to the qualifications the current and past Presidential officeholders for their position. Usually, this centers around questions of ability or sanity. For example, undoubtedly Andrew Johnson was not the sharpest knife in the drawer; and Richard Nixon must have been a mean s.o.b. Insanity: I don't readily know an example.
But there have been a profusion of jerks that have held that office.
Yes! No psychiatric diagnosis needed. Just the sense that the officeholder in question is an asshole. L.B.J., take a bow!
Look to examples among the governors of the various states. Yep, there were jerks aplenty among them. To use one close to home: Wallace. Or that clown from Illinois.
I may not know much about psychiatry; but I know a jerk when I see one. A jerk that doesn't know enough to control his tongue. Referring to several countries as 'shitholes' is not a way to make friends or conduct diplomacy, even with countries like Dorkistan.