It's unprofessional to discuss someone's race in the workplace.
Bill is in the break room of his office talking to a few coworkers.
Bill wants to chat casually with his coworkers.
Bill asks how everyone's weekend was.
Bill loudly asks Karen about her skin tone and what ethnicity she might be.
Everyone engages in light chit chat that is non-offensive.
Karen feels uncomfortable as if everyone is scrutinizing and categorizing her and applying stereotypes based on her background.