He just doesn't know how to react to it. You make a kid watch a movie like the shitty comic he drew just a year and tell him this made him famous and of course he's gonna lose all his shit.

Dave's shit is totally lost. He's pretty proud he didn't somehow flip out even if his mind is basically having it's own little war right now. He wants to comment on it, but that's like trying to comment on something you made. Except it's on the screen and not an webcomic.