The Reddit thread "We didn't know" on the r/clevercomebacks subreddit discusses the controversy surrounding Elon Musk being named Time Magazine's "Person of the Year" in 2021. The thread's posters debate whether this award is a true honor or merely recognition of someone who significantly impacted the world, even if negatively. Posters compare Musk's influence to other controversial "Persons of the Year," including Adolf Hitler and Joseph Stalin, highlighting how the award doesn't necessarily imply positive qualities. The discussion underscores how Musk's recent actions and public persona have shifted public perception of him, leading some to question his previous acclaim.