Responses
Well, that's the issue. He doesn't know but acts as if he does. And we can blame him for it because it's stupid to imagine that reading a couple of books makes you know more about a condition that the person who has lived with it his entire life. I don't think others hate him be he was more than insensitive here. If you read the comments of others who can relate to Ruri you will realise how much damage that kind of "concern" and "understanding" can do.
You cannot blame him for being that way, he doesn't know much about my peach puffs condition. It made it sound insensitive but it wasn't his intention. Don't hate him just yet, he is actually trying to understand Ruri-kun.