Aio. Towels on the floor

Ok, so I'm going to preface this by saying I have pretty obsessive hygiene rituals. I take showers, brushing my teeth, and being clean VERY seriously. So I moved in with my boyfriend and he used my towel instead of his. So I asked him to please never do that ever again.

Today I find out he's been using my TOWEL AS A BATH MAT. We already have a rug, but he puts my towel down on the floor to step onto as he leaves the shower.

He says I'm overreacting but idk because to me it's just really disgusting to put someone else's towel on the floor. Especially because we have a cat and her litter box is in there because we live in a small apartment. And also, that I already told him I don't like him using it for his clean body so wtf makes him think it's ok to put it on the floor?

Anyway I did yell about it because it genuinely felt very inconsiderate and he said he didn't think it would be a problem. But, that just makes 0 sense to me and I'm really considering what to do next because like... how could you not think putting my towell, that I use to dry my clean body, on the floor everyday wouldn't be a problem???

Anyway we got into a huge fight over it because he couldn't understand and claimed i was overreacting to something small.