I kind of imagine them doing their teaching bits just a day or two apart from each other, so each brother can hear what the other's saying about him.

Man, I can only wonder why Long Feng is putting up with the Dragon of the West and the former Phoenix King operating a tea shop in Ba Sing Se. How weird can it get? I mean, it's canon that Iroh opens up a tea shop there after everything, but the customers must be so weirded out. And yeah, poor Iroh, never having it occur to him that just because he doesn't like the way Ozai makes tea doesn't mean the customers don't. I wonder if the customers can even tell the difference...

Better than their former sort of fight, and probably vastly more entertaining (and less scary) for all involved.