The sass is nonoptional once you have befriended Wangji.

Tidus has an impressive array of skills, it has to be said. Even if this wasn't the desired result he has still contributed and for that, Wangji gives the kid a break.
"Using a weapon that you are unfamiliar with can have it's drawbacks." He agrees, picking his way back to Tidus's side through the debris.

"Are you unharmed? There seemed to be a significant amount of blowback from the technique." He isn't aiming for disapproval but the teacher in him cannot let this rest, "An improperly performed technique can be just as damaging for you as it is for the target."

He offers a hand down so Tidus can stand up, before the next statement knocks him for six.
"You can teleport?"