It's not so much me - but his room is often quite scary. He once dropped a glass on the floor and just left the pieces of shattered glass lying around. He also once left a bowl of porridge in a drawer in his room and went away on vacation, leaving it to rot there for a month.
Whoa, that's not....good. I have a hang up about broken glass and having it laying around would drive me up the wall, even if it's in a place I would never normally walk. Your flatmate has some issues....which I'm sure you are more than aware of, I just wanted to confirm them for you.