Are you an admin? That whole thing was unnecessary and at worst unprofessional. If dude wants his acc deleted, he doesn't need to be interrogated, especially publicly, on why he wants that. Whether he posts every 5 seconds or not does not matter in the slightest. His reasons are his own and none of our or your business. He wasn't being defensive, he was maintaining his privacy and avoiding the public interrogation that came from a simple question. You chose to try to make his actions look contradictory rather than just doing the task, I'd be a bit salty if I were him, too.