Thoughts on a host not allowing guests to leave items in the bathroom?

UPDATE: they have another bathroom. They accidentally left open a door that was originally always shut and marked “private” and I saw. I’m guessing that’s the woman’s bathroom and the one we use is the husband’s.

This is my third airbnb experience so far. I’m looking for some insight from hosts as this seems a little strange to me and has proved to be a little irksome. I’m staying with a friend in a very small room with two twin beds in a two bedroom, one bathroom apartment. Our hosts live here and will be here for the duration of the visit (obviously normal). The hosts have racked up laminated “house rules” all over the apartment, and one of the “bathroom rules” is that we aren’t allowed to leave any of our belongings in it. So, we have to carry our toiletry bags two and from our room whenever we need to use the (shared) bathroom. I accidentally left my face wash on the sink, and the hand towel they left hanging on the rack, and when I returned to the bathroom they had set both off to the side. I know it doesn’t sound like a huge deal, but it feels like we have to tiptoe around them and try to make ourselves as scarce as possible - especially given their preference for quietness at all times. It just seems unnecessary to have to take my shampoo out of the shower every time I use it, when it hardly seems in the way in the corner of their large walk in shower.

My question is, if you are so opposed to seeing a guest’s toothbrush on your sink, why host anyway? I’m curious what other people think, and if this is normal and I’m just being picky.