Apparently that day was back in February, when Newsweek ran a cover on their Japan issue with a broken American flag in the trash can (picture can be seen here, hat tip: Charlie Sykes). The caption, according to blogger Riding Sun, "The day America died."
If you don't remember that cover here in the United States, you're right. It was a Japan-only edition. I guess trashing the flag is only acceptable for the overseas editions.
No comment yet from Newsweek why they didn't just burn a flag. Perhaps that's finally becoming trite?