So we've established that Zuko just didn't know that Aang was trapped in an iceberg for 100 years and was understandably confused as to how the Avatar is a 12yr old little shit straight from the airtemples and also just never asked anyone bc he didn't want to be rude, right? Yea here's a follow up to that:
Zuko: hey so how long had aang even been hiding out at your village?
Zuko: before i came in and kinda destroyed the whole place, sorryaboutthatbytheway, how long was he there, like when did he come to you guys?
Sokka: oh he didn't come to us, and katara and i had only found him like a day earlier so
Zuko: you-? you found him?
Zuko: what do you mean you just found him?
Sokka: well we got lost on a hunting trip and katara got mad at me and yelled and y'know how when katara yells weird stuff happens like ice starts forming and breaking and stuff? Yea she kinda broke an iceberg and aang happened to be in there
Zuko: you're telling me that you found the avatar
Zuko: after 100 years of him disappearing and the most expert navigators and detectives trying to find him and failing
Zuko: after generations of firelords before hired every hitman they could get and all of them returning empty handed
Zuko: after 3 years of me searching every desolate corner of the world desperately trying to prove myself and losing sleep over it
Zuko: and you did it by accident???
Zuko: i need to sit down for a minute.