[ Horikawa easily caught the young man's rude gesture. He's someone who values good poise and manners, so that does get on his nerve. But he merely continues smiling.

Losing his calm in front of a stranger is hardly appropriate, no matter how irritating the gesture was, especially not at a social gathering. Though, that easily gave away the fact this person in front of him is most likely... one of Those Types. ]

I apologize for disappointing you.

[ He doesn't know what exactly the other man is referring to (three sizes???), but he has this strong sensation that he's disappointed over something stupid. He'll move on for now, thinking it might be best. ]

Though, thank you for noticing. If you managed such an observation, then you're a sharp one yourself.