I had a fat roommate and can confirm. Ugh I tried to make sure and do my laundry before her, too, because her clothes were greasy (it's hard to describe, they almost felt waxy?) and no matter how much detergent she used, they'd still smell and it would even permeate the washer/drier to the point MY clothes would smell and get that texture if I used the appliances after her. If she did go before me, I'd do a load of towels with bleach or a load of bedding on hot, just to make sure my clothes didn't get the weird fatgirl smell/film on them. Nothing like cohabitation with a fat to get redpilled, real quick.