From the article:
“The United States will remember this day in which it was singled out in this assembly for the very act of exercising our right as a sovereign nation,” Haley told member nations ahead of their vote.
Every time
any nation takes a given action or makes a statement to a given effect/end, it does so in the exercise of its rights as a sovereign nation. The U.S. and all other nations, in turn, voice their satisfaction or dissatisfaction with that nation's words/deeds. The U.S. government took a position, and the remaining nations of the world have voiced their dissatisfaction with that position as is their right. Trump, in response has opted to throw a temper tantrum borne of vengeful, "might makes right," American exceptionalist dejectedness. Trite, vulgar and typical as Trump is wont to be.