[ Zuko has feelings about his feelings, okay. But he's also self-aware enough to know that Hikaru thinks he's in the right — he's received enough "comfort" about his scar from others to know the way it goes. He's mindful enough to realize he's the one who's being irrational, immature, pouty to be glaring at Hikaru for not having a scarred face... but Hikaru's still insulting Zuko's physical appearance even if he feels it's benign, so his mindfulness isn't really worth much over his reactivity. ]

What's "my" issue? What's your issue?! Why do you care so much what my hair looks like? Sorry I'm not a rich little bon-bon pretty-boy with a cute haircut. My bad.

[ Yikes. Come thru, teenage masculinity. Ouch. ]