Almost sexually harassed and dad doesn’t care

A year or so ago, I would always take showers outside, I live in a warm state so i never got cold. The shower is enclosed and has a lock and people from the outside can’t see me because it was designed to be private. I have tenants and they are not allowed to use the shower, it is only for my family and I. One day I was trying to shower and my tenant tried to open the door, I’m pretty sure he knew i was showering and because he could hear it running and you can see the shower head from the outside because it sits at a higher height. He kept trying to open the door even though I said angrily that someone was in here and to leave me alone. And then after several attempts of him trying to open it and me getting mad he eventually said sorry and left. I never told my dad or anyone because I was embarrassed. I told my dad about it recently because of some problems we are having with them and he brushed it off and angrily told me, “what do you want me to do? You want me to find new tenants!!?? It’s not that easy!!” And I felt hurt because my own father doesn’t even seem to care. I am terrified to think what could’ve happened to me had that door opened. Even if he just saw me standing naked I would feel so violated since he had no business trying to open it. Anyways, I’m crying my eyes out and I’m shaking because I can’t believe my own dad brushed it off like it was nothing. For some reason he always defends everything that they do. I’m so tired of it. Sometimes I want to forget that my dad exists and I want to run away and not look back. My mom lives over 3000 miles away and I wish she were here.