Cheap Toilet Paper
Many of the worst roommates exhibit selfish behavior and don’t pull their weight in the house. People often share essentials like toilet paper and milk because everybody uses them. Sometimes they’ll take turns to buy it because it keeps everything fair. However, this Redditor had a fair complaint about the person she lived with.

Toebass wrote: “I used to live with someone who would only buy crappy cheap toilet paper when it was her turn, but would hoard for herself rolls of the good stuff me and my other housemate would buy.” This is horrendous behavior but there are people like that out there.