[“Let me remind you that I haven’t seen you in person in like, a month, Researcher Pakku gave me the week to hang out with you, and instead of giving your favorite sister your undivided attention, you’re texting some weirdo who sends you...memes?”
“They’re really good memes, though!” Sokka protests, and shows her. Katara is not impressed.
“...Sokka, it’s a picture of a dude and a Butterfree going ‘is this a Pidgey?’. I think you need better taste in memes. And maybe friends.”]
Or,
The one where Katara very seriously considers an intervention for her brother.