Probably not the wisest words to say to someone like Black Star. When the kid commented on his height, Black Star's eye twitched just a moment and he flailed just a little, pointing his finger still at the other boy and shaking it wildly. "I am the biggest person there is! You should know that! Don't go forgetting it. I'm Black Star, the greatest assassin there ever was."
This kid was...weird, in his opinion. The boy was just looking at him like he was just trying to figure things out. Black Star without Tsubaki was a little less polite than usual, especially without Maka around, too. Both girls usually seemed to know how to knock some sense into him. Soul usually brought him down a peg or two as well, but they were more bros than anything else.
He grinned, holding out the hand that was shaking his finger at the strange kid right now. "Since you're obviously new here, I'll forgive you this time! But don't you ever forget that I'm the greatest person around here. I'm Black Star!" he shouted his name loudly, loud enough to be heard in the town below the wall. He really didn't care about who thought what of him so as long as someone didn't make fun of him.