I recently upgraded every one of my colonist's bedrooms with a private bathroom. I didn't have much space, so I made 2x2 bathrooms with a toilet, a shower, a basin, and a wall light, with some nice slate tile flooring.

Everything seemed to be completely fine until i realized half a day later that none of them were actually assigned, so I went around and assigned all of my bathrooms to their respective beds, and immediately all of my colonists were hit with a "-4 (Awful bathroom)" debuff.

Considering how bad my public bathrooms were beforehand, it seems kind of weird that they were completely fine using tiny, low quality public bathrooms, but as soon as they get their own, MUCH NICER, bathrooms, they get a debuff because they don't like them. I unfortunately built all of my bedrooms before I realized, so there's no room to expand them anymore, but I hate that i can get rid of the debuff just by unlinking the bathrooms....and then other people walk into their bedroom to use the bathroom.