Date: July 29
Tweeter: @morgastoss
Tweet: “I’d batter the Koreans, burn them all.” (Translation)

Swiss soccer player Michel Morganella was banned from playing in the 2012 London games for posting offensive tweets targeting South Koreans after the team’s 2-1 win. In short, he talked about pummeling them and used a slanderous French term to imply each one has Down Syndrome. Swiss Olympic team chief Gian Gilli said Morganella "discriminated against, insulted and violated the dignity of the South Korea football team as well as the South Korean people." His Twitter account’s been shut down ever since.