[Youichi knows you're bad at video games, why else would he invite you to play from time to time other than to get a good laugh?

When someone hits him from behind, he turns to look over at Kazuya. Oh hey it's you.]

Hey it ain't my fault Sawamura's too much of a loud idiot who doesn't know how to address upperclassmen properly.

Besides... you're the older bro for him now, he's gonna whine to you no matter what.

[Here's another one of his laughs.

But there's also the fact that it's fun to make fun of Sawamura a lot.]