Our former allies, as well as underdeveloped nations now know that the U.S cannot be trusted as a trading/defense partner, as we have severe regime swings every 4 to 8 years. Whereas it was always possible for minor policy changes, the nation is now viewed as having just enough morons in the voting public to install a buffoon like trump.
Throughout history, our foreign policies were fairly similar no matter who was in charge of our govt.. Certain attitudes toward world security were set in stone. Right now, it is clear that we have an impotent, incompetent old man in charge, who aspires to be a dictator. He's capable of severe mood swings due to his dementia, with corresponding actions that no stable nation would ever enact.
Whereas the U.S is very tough to move on from due to our wealth, it is time for the world to band together and move past this behemoth.