By Josh Moss
josh@louisville.com

OK, so by now you know the comedy “Tropic Thunder” is about some prissy actors who travel to Southeast Asia to film “the greatest war movie ever.” You’ve also probably heard that Ironman himself, Robert Downey Jr., plays Kirk Lazarus, an Australian Method actor who dyes his skin to portray an African American sergeant. Surprisingly, that hasn’t been the picture’s most controversial element.