If someone wants to go be friends with a 24 year old dude from Iowa, free country. My point is any reasonable person will realize it's a completely untenable position for A-B to have direct association with a person who has publicly made jokes comparing black mothers to gorillas.
EDIT: having said all of that, it was probably a waste of resources for the newspaper to look into the guy's background in the first place. Although my guess is someone Googled the dude's name and easily found his Twitter, so it wasn't exactly Woodward and Bernstein-level investigative journalism. He wasn't profiting off the deal. But they did, and here we are, cat's out of the bag, and there's no way A-B can associate with him. And I doubt they're associating with the reporter either.