That isn't normal being pissed off either. Yamato looks worried and Iowa looks ready to eviscerate someone. Whatever Yamato did she definitely pushed the wrong button.
Yamato probably said something about the War that is a hot topic for the US but meh for Japan. Like how you occasionally hear that Pearl Harbor was a smart idea. And Iowa here is reminding Yamato that the US built more ship in four years then Japan did in the last twenty.