A smile that may appear grateful for that understanding is likely more an effort to hold back laughter. Like he really cares about things like friendship. But it seems that saying it has made some sort of impact. A useful thing to note as he begins to wander off to get started.

"Does that mean they have the kinds you like?" Though he is asking Shouto, it seems he's just going to count on him following, rather than turn back towards him. "I've wanted to try more, since I got here, so I'll go with you."