Lol, so you have a beef with the casting of Dragonball for not having enough Asians... and having Goku played by a white kid? A series that has no real setting on Earth, the main character is an Alien, characters with green, purple, blue hair are abundant, some characters with Green skin, etc... Please, go whinne about something else. Nothing really wrong with casting white people for the roles, especially for a movie being released in the US, not by any stretch of the imagination.
If there's something to complain about is for the actual plot and story changes... but to complain about the casting solely because they have a couple of white kids playing leading roles is kinda dumb.