Keith just snorts at that, letting it drift past as the largely-meaningless chatter it is. He would indulge Shiro in it, but there's... other stuff on his mind.

"You know I'm not actually made of glass, right?"

-is probably a bad way to start this conversation, but if there's a good way, then Keith has no idea what it is. He's never been great at sensitive conversations, especially when he's already let the subject matter bubble up and boil over to the point where he has to say something. The fact that he's also kind of mad at himself for not being able to just shut up and let Shiro do what he's comfortable with doesn't help, either.