He knows he handle Shu the wrong way and it even lead Shu to think he is bothersome and become hikikomori. He apologized but he did it again.

Shu want to make illustration, he think maybe he can makes people happy with it, I understand when he said about to take care more for his study but you don't need to say, "Just doing this for your amusement is disrespectful to the people around you". Fuck you, shut up your mouth. Shu is a sensitive kid, he will think he is bothersome again or it's his fault, don't you even learn about him?

Then next time Shu meet someone he really connect well in internet, he and his brother ruin their moment by suddenly appear (I mean even if Shu's friend run away because of other reason, your are disturbing their moment) and when FL said this is Gen's fault, HE DOESNT EVEN A BIT THINK MAYBE IT'S HIS FAULT. Asshole. "Why it's our fault, she is the rude one. She run away because she feels guilty about something. She is villainess"
Lemme tell you something you blockhead, in the past you "intervene" when Shu was bullied and it cause Shu to be hikikomori because you handle it the wrong way, and now he doesn't even think maybe he handle it the wrong way again. Again, Shu is sad. You don't know how to handle him, that's fact because if you know you won't say unsensitive words and you won't make him unmotivated by your bias experience. (You ever experience that, doesnt mean other people is the same). I have bunch of online friends, never have any bad experience, hear him bias view of it even if he never have online frienda and never try to understand is annoying as fuck. While FL try to understand Shu way of thinking and view, Gen immediately say "No". Shut the fuck up.

The one that really understand Shu is the FL. Thanks god she is there. She never say something make Shu uncomfortable, always supporting him, she doesn't interfere, just watch after him.