Think of your housemates like the cartoon Tasmanian Devil. They are constantly looking for someone or something to ruin and destroy. They pick and insult, question and challenge for no reason other than they have to. They rearrange homes, decorate and then question their choices. They buy new clothes, then question those choices, collect shoes and trinkets because they are overcompensating and then get mad at you because there isn't enough room for all their garbage. Then if it goes sour, they turn violent, yelling and screaming, physically attacking because they can't control themself. With some of mine, their nature was destruction. They were constant chaos because noone else and definitely not their old flatmates, has ever told them to be quiet, sit down and start acting like an adult.