AITA for taking a shower at 11pm?

I (20F) have chronic neck pain and a diagnosed panic disorder. As part of my pain management and coping skills, I lay down in the bathtub and use the showerhead against my chest. This is relevant because it helps with both my pain and panic attacks. Additionally, I'm currently sick, and showering has been helping with that too.

Tonight, I took a shower around 11 PM. Suddenly, I heard a knock on the bathroom door, and my roommate's (28F) boyfriend (29M) started yelling at me. He demanded to know what I was doing, called me horrible for taking a shower at 11 PM, and accused me of waking him up. This was especially upsetting because he knows about my pain and panic disorder.

When I got out of the shower, he started the argument again. He brought up that we’re supposed to be quiet after 10 PM (something discussed during a house meeting) as his justification. However, during that meeting, I specifically stated that I might need to take showers after 10 PM due to my health issues, and everyone—including him—agreed. He dismissed this, accusing me of lying, because it wasn’t explicitly written in the house rules.

Throughout the argument, he kept interrupting me and became upset when I interrupted him once. Eventually, I lost patience and told him to shut up. At that point, he began mocking me, making fun of my dyslexia by calling me a "retard" and saying I probably can't read, which is why I’m "breaking the rules." He also accused me of lying again, claiming I wasn’t taking a shower but actually taking a bath. He insisted he could hear me lying in the tub. I tried explaining how I shower, but he interrupted me again. (Why does this matter to him????)

The argument became very heated. He accused me of bothering him with my problems and said that other people in the house need to sleep because "some people need to go to school or work tomorrow." This was a clear jab at me since I’m not currently working or in school due to my poor mental health following a traumatic event.

None of my actual roommates have ever complained about my late showers. In fact, they’ve encouraged it because they understand how severe my pain and panic attacks can be.

So, AITA?

EDIT: no he dosent pay any rent and he is here about 3 times a week.