Kirigakure. Well, they'd never been particularly well known for getting along with that village, so that might explain the tension. Haku's question must have also simply been asked out of politeness. If he knew Naruto-kun, then he should be aware of what village he was from.

But he would answer with the same politeness. "Konohagakure." He rubbed at the back of his neck, trying to look embarrassed. "It's funny. I don't think I knew what the confrontation was about."