In a word, yes. He has very silly notions about what it means to be mature.

That last comment certainly stung and for a moment, he could only blink and stare in wide-eyed shock, before frowning.

"I... wasn't trying to be, sorry."

He felt rather bad about slipping into an old habit, so he just quietly looked down. No more sarcastic comments, at least.

"You do seem very strong, I guess I still have more to learn..."