Old Reddit lore includes a story from a guy who was playing soccer in high school, and he and another player went for the ball at the same time, and he kicked the other kid in the shin, really hard.

The kid was in terrible pain, and the guy felt horrible, and in the heat of the moment, wanted to say “Are you okay?” AND “Im sorry!” but just ended up yelling “ARE YOU SORRY?!” It sounded like a vicious taunt at serious hurting player, but it was totally unintentional, and it haunted him for years.

After that story, “ARE YOU SORRY?!” became a Reddit response when anyone got hurt.