AITA for refusing to allow my roommate to install a bidet in our shared bathroom

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The original was posted on /r/AmItheAsshole by /u/ahbidet on 2023-07-22 02:43:09.

I (23M) live with my roommate (22F). She moved into my place only a month ago because my previous roommate decided to move out of state. I did not know she was a woman because she has a gender neutral name and my previous roommate found her while I was out of town.

Admittedly I have only lived with men before but I had no issue with having a female roommate. She seemed friendly and nice so at first it seemed alright however as I observed her habits, idk I just found somethings a bit icky, like how she eats loads of cottage cheese, how different she seems when not dressed up, feet on the couch etc.

Recently she told me she wanted to install a bidet attachment to our toilet. I find the idea of that extremely disgusting, I can imagine ass water rebounding and splashing all over, not to mention period and vaginal discharge. I told her no and mentioned how disgusting it was due to splash back. She argued a little but agreed to not do it.

However now she is being less friendly. And based on what I hear when she is in the bathroom I feel like she might be using the shower to clean up sometimes. This makes me feel a bit more icky as now I am imagining contaminated water in the tub and her moist ass sitting on the couches and armchairs causing them to absorb her fluids. It has been over a week and she is still more distant, we used to watch movies and stuff together and I do miss that a little, and things feel awkward just because I said no.

AITA here? Everyone uses toilet paper here and it feels like the more sanitary option.