Every culture has a custom that others would deem weird. For the folks in South Korea throwing toffees at someone is definitely on the list. Apparently in Korea if you throw toffees at someone it is an insult that translates to “eat this d%ck.” The Korean toffees are long and suppose to represent a phallus.
The Korean world cup team put on a not so great performance at the World Cup tieing once and losing twice. So their fans took exception, check it out!