A joke

You : Hi.
Stranger : Hi.
You : Name ?
Stranger : Chun Wu at your service.
You : Alexander Goldberg.
You : You know I never forgave you Koreans for attacking Pearl Harbor.
Stranger : Uhhh. I'm Chinese...and that was the Japanese who attacked it.
You : Chinese, Japanese, Korean... What's the difference...?
Stranger : ...
Stranger : Are you serious ?
You : Yeah.
Stranger : ...
Stranger : You know I never forgave you Jews for sinking the Titanic.
You : That was an iceberg.
Stranger : Goldberg, Greenberg, Iceber... What's the difference...?