I'm going to put my roommate's belongings in a pile
Why are you planning to do this?
Because my roommate is being weird.
I know how unexplainable behavior can be upsetting, but it's better to find out what's behind it first. Maybe there's something going in their lives you're unaware of. Sometimes people just need a little understanding.
What are you talking about? Most people will laugh at the stuff in his room and does weird things. I know him well.
At the end of the day he's your roommate so you're expected to get along with him. Probably you should hang out with him mmor to understand what he's really like. Maybe that'll change your opinion.