Makoto isn't surprised that it's difficult. He'd be weirded out to see his parents or his sister alive and well again, and they passed away almost ten years ago. It's a little bit harder to comfort someone about his own death though. What do you even say to someone about that?

"Wanna talk about it or take your mind off of it?" Either way Makoto isn't just going to not be there for Ken, even if the source of his emotional distress is a little bit surreal to Makoto himself.