Maybe it's just because you keep asking questions that inspire his straightforwardly blunt and upsetting answers.

"I knew it was. There are too many 'k's for it to be anything else." 'K's. 'Z's. 'Y's. Polish has a certain way of identifying itself. "My name is Uchiha Sasuke, Sasuke Uchiha in Western order. It's Japanese and not too difficult to pronounce. Now you."