> "I'm sorry, but there's no other word one can use but racist," Colville said, responding to reporters at a news conference in Geneva, Switzerland. "You cannot dismiss entire countries and continents as 'shitholes' whose entire populations, who are not white, are therefore not welcome."

You missed that second part.

Looks like they’re talking about dismissing the people of those countries just because they are from, what they consider, a ‘shithole’ country/continent.