It's impressive! Sokka obviously thinks so because his first-response smartass remark pauses in favor of smirking at Steph and choosing a nicer one.

"I hate to break this to you, Steph, but you aren't nearly as demanding or evil as you think you are. There's not a whole lot anyone can make Mel do, and I like to pretend like I'm not too far from that, too."

They came because they wanted to. Nothing more or less.